Abuja, July 18 (RHC)-- Triple bomb attacks targeting religious gatherings in Nigeria's troubled northeast have killed at least 13 people and injured some others, security and medical sources say.

A security volunteer said at least two people were killed after twin explosions went off in the northeast Nigerian town of Damaturu in Yobe State, where worshippers had gathered to attend the Eid al-Fitr prayer, marking the end of the fasting month of Ramadan. A third bomb moments later went off near a mosque in the troubled town, leaving another 11 dead.

No group has claimed responsibility for the latest attacks, but they bear the hallmark of Boko Haram Takfiri militants.

The developments come a day after twin explosions hit a market in Nigeria’s northeastern city of Gombe, leaving about 50 people dead. The first blast occurred outside a footwear shop in Gombe, followed by a second explosion just minutes later.

Earlier this week, the militants killed at least 43 people during a series of deadly attacks on four villages in Nigeria's northeastern Borno State.

Nigerian President Muhammadu Buhari has vowed to tackle Boko Haram militancy which is currently plaguing the West African nation. Boko Haram has intensified its attacks since Buhari came to power on May 29th. The president has since made the crackdown on militants his top priority.

The Boko Haram militancy has left some 15,000 people dead and around 1.5 million others displaced across Nigeria since 2009. In recent months, the militancy has spilled over into several neighboring African nations as well.