A letter addressed to US President Barack Obama tested positive for ricin, spreading alarm in a drama over poisoned mail Wednesday in Washington -- which was already on edge after the Boston bombings.
The FBI said there was no connection between the item sent to Obama, which was detected at a remote mail facility, and another sent to Republican Senator Roger Wicker, and blasts at the Boston marathon which killed three people.
After preliminary tests on the Obama letter showed traces of ricin, further examinations will be carried out over the next 24 to 48 hours, the FBI said.
The US Secret Service said the letter to Obama had been intercepted at a mail screening site on Tuesday, the same day authorities said a letter was sent to Wicker that also showed traces of ricin.
Ricin -- a highly toxic protein found in castor beans -- can, when inhaled, cause respiratory problems. Ingested orally, it is lethal in even miniscule quantities.
Secret Service spokesman Edwin Donovan said the agency, which protects the president and his family, was working closely with the US Capitol Police and the FBI to trace the origins of the letter.
NBC News cited unidentified government sources as saying that officials believed they knew who sent the letters, reportedly with a Tennessee postmark, but that no arrests had been made pending the further tests.
The FBI said in a statement that a filter at a second mail facility had tested positive for ricin, and warned that more letters could be received.
But it added: "There is no indication of a connection to the attack in Boston."
The White House deflected inquiries on the incident to the FBI and the Secret Service.
Senator Carl Levin meanwhile issued a statement saying one of his staffers had discovered a "suspicious-looking letter" at a regional office in Michigan and handed it over to authorities for further investigation.
The person had no symptoms, but was being held in hospital overnight as a precaution, the senator said.
Adding to nervousness in the US capital, two Senate office buildings were briefly cordoned off amid reports of a suspicious package, but were reopened after the all-clear was given.
US Capitol Police confirmed one man was being questioned.
"Right now they are interviewing a person but that person is not in custody. He has not been detained," a US Capitol Police officer told AFP.
Republican Senator Jim Risch told AFP that everyone on Capitol Hill was perpetually as "vigilant as they can be" and that such scares had been part of life for many years.
The poisoned mail episodes recalled the mysterious series of letters laced with anthrax sent to lawmakers and some journalists, which killed five people and sickened 17 others, following the September 11 attacks in 2001.
Congressional mail has been screened off-site ever since.
Three Senate office buildings were shut in 2004 after tests found ricin in mail that had been sent to the Senate majority leader's office.
The biological agent was also sent to the White House and the Department of Transportation in November 2003. There were no injuries in those incidents.
AFP
Thu Apr 18 2013
![Letter addressed to Obama tests positive for ricin Letter addressed to Obama tests positive for ricin](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/http://img.astroawani.com/2013-04/51366245786_295x200.jpg)
10 Berita Pilihan - (16 Julai 2024
Antara pelbagai berita dalam dan luar negara yang disiarkan di Astro AWANI, berikut adalah yang paling menjadi tumpuan sepanjang hari ini.
PAC beri tempoh tiga bulan kepada HRD Corp
Jawatankuasa Kira-kira Wang Negara (PAC) memberi tempoh tiga bulan kepada Perbadanan Pembangunan Sumber Manusia (HRD Corp) untuk mengemukakan laporan tindakan susulan terhadap syor jawatankuasa itu.
Kylian Mbappe tandatangan kontrak dengan Real Madrid
Bintang bola sepak Perancis Kylian Mbappe menandatangani kontrak selama lima tahun dengan kelab Sepanyol Real Madrid pada Selasa.
Pelepasan ketujuh air sisa nuklear Fukushima ke laut selesai
Jepun telah menyelesaikan pusingan ketujuh pelepasan air sisa radioaktif yang dirawat dari loji kuasa nuklear Fukushima Daiichi ke Lautan Pasifik pada Selasa.
Empat termasuk kapten maut dalam pertempuran
Empat anggota tentera India termasuk kapten meninggal dunia akibat kecederaan selepas pertempuuran pada malam isnin di Hutan Desa.
Pakistan sahkan 4 warganya terbunuh di Oman
Pakistan berkata pada Selasa empat warganya terbunuh dalam insiden tembakan pada malam Isnin berhampiran ibu negara Oman, Muscat.
Lima terbunuh, puluhan cedera dalam protes antikuota di Bangladesh
Sekurang-kurangnya empat orang terbunuh dan puluhan lagi cedera dalam pertempuran antara pelajar yang memprotes sistem kuota dalam pekerjaan sektor awam dan polis di pelbagai bahagian Bangladesh pada Selasa.
Kerajaan cadang perkenal pembiayaan swasta
Kerajaan menyasarkan untuk memperkenalkan pembiayaan swasta alternatif bagi memastikan kemampanan kewangan program sektor air, sekali gus mengurangkan kebergantungan pada perbelanjaan kerajaan dan mengukuhkan daya tahan.
Saya tak fitnah Guan Eng, cuma jelaskan siasatan SPRM - Muhyiddin
Presiden Bersatu Tan Sri Muhyiddin Yassin memberitahu Mahkamah Tinggi Kuala Lumpur hari ini bahawa beliau tidak memfitnah Lim Guan Eng berhubung isu pengecualian cukai terhadap Yayasan Albukhary
KPT alu-alukan dapatan, cadangan PAC - Zambry
Ini termasuklah cadangan pelaksanaan Garis Panduan Pelaburan dan Pembiayaan oleh Universiti Awam 2024 kepada anak-anak syarikat di bawah seliaan Kementerian Pendidikan Tinggi (KPT).
![Tiada tempat untuk keganasan politik dalam demokrasi AS - Obama Tiada tempat untuk keganasan politik dalam demokrasi AS - Obama](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-07/81721093818_JoeBiden.jpg)
Tiada tempat untuk keganasan politik dalam demokrasi AS - Obama
Kenyataan Obama mengundang kecaman warganet terutamanya istilah 'keganasan politik' yang dikatakan menunjukkan sisi hipokrasi Washington.
![Kematian tukang masak peribadi Barack Obama diisytihar satu kemalangan Kematian tukang masak peribadi Barack Obama diisytihar satu kemalangan](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-08/61692782695_Obamaschef.jpg)
Kematian tukang masak peribadi Barack Obama diisytihar satu kemalangan
Punca kematian diisytiharkan sebagai kes lemas dan cara kematian disahkan sebagai satu kemalangan.
![Tukang masak peribadi Barack Obama ditemukan lemas Tukang masak peribadi Barack Obama ditemukan lemas](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-07/51690258357_TafariCampbell.jpg)
Tukang masak peribadi Barack Obama ditemukan lemas
Mendiang Campbell meninggalkan seorang isteri, Sherise dan sepasang anak kembar.
![Kes 1MDB: Jho Low rancang derma RM132 juta kempen Obama 2012 Kes 1MDB: Jho Low rancang derma RM132 juta kempen Obama 2012](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-04/61680574517_LeonardoDiCaprio.jpg)
Kes 1MDB: Jho Low rancang derma RM132 juta kempen Obama 2012
DiCaprio memberitahu juri bahawa Jho Low merancang untuk menderma sekitar AS$30 juta bagi membantu kempen pemilihan semula Barack Obama.
![Naib Presiden AS Kamala Harris mulakan lawatan seminggu ke Afrika Naib Presiden AS Kamala Harris mulakan lawatan seminggu ke Afrika](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-03/81679810080_TBSINGHARRIS.jpg)
Naib Presiden AS Kamala Harris mulakan lawatan seminggu ke Afrika
Kamala Harris memulakan lawatan seminggu ke Afrika bermula hujung minggu ini.
![Pemimpin, selebriti dan peminat bola sepak dunia ratapi pemergian Pele Pemimpin, selebriti dan peminat bola sepak dunia ratapi pemergian Pele](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2022-12/71672348957_Pele.jpg)
Pemimpin, selebriti dan peminat bola sepak dunia ratapi pemergian Pele
Pele meninggal dunia pada usia 82 tahun selepas bertarung dengan kanser kolon.
![Obama, Michelle kembali ke White House untuk lancar potret rasmi Obama, Michelle kembali ke White House untuk lancar potret rasmi](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2022-09/81662617460_TBOBAMAPOTRAIT.jpg)
Obama, Michelle kembali ke White House untuk lancar potret rasmi
Bekas Presiden Amerika Syarikat (AS) Barack Obama dan isteri Michelle Obama kembali ke Rumah Putih untuk melancarkan potret rasmi mereka.
![Obama umum positif COVID-19 Obama umum positif COVID-19](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2020-05/81589708053_barackobama.jpg)
Obama umum positif COVID-19
Beliau dalam pada itu turut memaklumkan isterinya Bekas Wanita Pertama Michelle negatif jangkitan itu setakat ini.
![Pertembungan generasi tua dan muda sebenarnya cetuskan cabaran berbahaya - Obama Pertembungan generasi tua dan muda sebenarnya cetuskan cabaran berbahaya - Obama](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2021-09/71631868942_TBBARACKOBAMA.jpg)
Pertembungan generasi tua dan muda sebenarnya cetuskan cabaran berbahaya - Obama
Masih ramai golongan berusia yang berada di takuk lama termasuk cara kepimpinan dan pemikiran
![Sisi luka perang di Afghanistan tinggalan Amerika Sisi luka perang di Afghanistan tinggalan Amerika](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2021-08/41630396961_TBUSARMY.jpg)
Sisi luka perang di Afghanistan tinggalan Amerika
Sorotan kesan misi hampir dua dekad tentera Amerika Syarikat di Afghanistan ke atas generasi kanak-kanak, yang paling terdera disebabkan perang. Nasib mereka terus tidak menentu di tangan Taliban