A bomb exploded earlier Tuesday morning in a local busy market area in Maiduguri, a northern city in Nigeria, killing at least 15 and wounding several others.

No group has yet claimed responsibility for this latest terrorist attack, but suspicions fall on the extremist Islamist group Boko Haram, whose terrorist attacks in Maiduguri has killed at least hundreds of civilians.

Nigerian military security force confirmed the explosion and said the bomb was hidden at the back of a vehicle carrying charcoal.

This latest bomb explosion at the market came a day after the Nigerian military force said it has arrested a main suspect, a Nigerian businessman, who is a member of a local vigilante group, and allegedly is linked to Boko Haram.

The suspect allegedly used the vigilante group as a cover to gather and supply information to Boko Haram, and is accused of being involved in the April kidnapping of the 200 plus schoolgirls from a boarding school, and other terrorist attacks carried out by Boko Haram, the military said.

Two women suspects were also arrested in connection to the attacks. The women suspects are said to be employees of the extremist Islamist group.

These arrests came after the international community has immersed pressure on the Nigerian military security and the government to provide answers regarding the whereabouts of the kidnapped schoolgirls. The government has been criticized for not responding swiftly to help finding the schoolgirls or curb the rise of the terrorism in the country.

There are unconfirmed reports that several generals, and highly connected military members have been arrested, in part for allegedly assisting Boko Haram through illegal weapon sales and buying, though the Nigerian military security has denied the reports.

Maiduguri, the capital of Borno state, which housed the military barracks base, is supposed to be a safe haven for local civilians. Instead, it has become the epic center for Boko Haram terrorist activities.

The group attacked the military barracks recently.

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