UN Secretary-General Ban Ki- moon on Tuesday strongly condemned Boko Haram attacks which deliberately targeted Christian and Muslim worshippers during the Muslim holy month of Ramadan in northeast Nigeria.

More than 100 people were killed in the latest wave of Boko Haram attacks on three towns in Nigeria's northeastern Borno State since the end of last month.

On Sunday, six persons were killed in a suicide bomb attack on a church in Potiskum, a commercial town in northeast state of Yobe, Nigeria.

"The Secretary-General renews his calls to support the operationalization of the Multi-National Joint Task Force (MNJTF) through the provision of the requisite political, logistical, and financial resources and necessary expertise, consistent with international humanitarian, human rights and refugee law," said a statement released by Ban's spokesperson.

Boko Haram, which has become a major security threat in Nigeria since 2009, seeks to enshrine the Islamic Sharia law in the constitution of Nigeria. The group has so far killed more than 13, 000 people and displaced over one million others in various armed attacks in the country.