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People watch as smoke fills the sky, after an explosion, at a shopping mall, Wednesday, June 25, 2014, in Abuja, Nigeria. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo) ( Nigeria Explosion )

Rescue workers carry the remains of a person in a body bag, after a explosion at a shopping mall in Abuja, Nigeria, Wednesday, June 25, 2014. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo/Olamikan Gbemiga) ( APTOPIX Nigeria Explosion )

An injured woman is assisted, after an explosion, at a shopping mall, Wednesday, June 25, 2014, in Abuja, Nigeria. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo) ( Nigeria Explosion )

An injured person is assisted, after an explosion, at a shopping mall, Wednesday, June 25, 2014, in Abuja, Nigeria. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo) ( Nigeria Explosion )

Rescue service work at the scene of an explosion at a shopping mall in Abuja, Nigeria, Wednesday, June 25, 2014. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo/Olamikan Gbemiga) ( Nigeria Explosion )

People watch as smoke fills the sky, after an explosion, at a shopping mall, Wednesday, June 25, 2014, in Abuja, Nigeria. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo) ( Nigeria Explosion )

Nigerian soldiers patrol the area, near the scene of an explosion in Abuja, Nigeria, Wednesday, June 25, 2014. (AP Photo/Olamikan Gbemiga) ( Nigeria Explosion )

Nigerian troops, right, stand at the scene of an explosion in Abuja, Nigeria, Wednesday, June 25, 2014. (AP Photo/Olamikan Gbemiga) ( Nigeria Explosion )

Rescue services work at the scene of an explosion, in Abuja, Nigeria, Wednesday, June 25, 2014. (AP Photo/Olamikan Gbemiga) ( Nigeria Explosion )

Members of the Nigerian armed forces, left, stand guard, at the scene of an explosion in Abuja, Nigeria, Wednesday, June 25, 2014. (AP Photo/Olamikan Gbemiga) ( Nigeria Explosion )

A Nigerian soldier, left, stands guard, at the scene of an explosion in Abuja, Nigeria, Wednesday, June 25, 2014. An explosion rocked a shopping mall in Nigeria's capital, Abuja, on Wednesday and police say at least over 20 people have been killed and many wounded. Witnesses say body parts were scattered around the exit to Emab Plaza, in the upscale Wuse 11 suburb. (AP Photo/Olamikan Gbemiga) ( Nigeria Explosion )