BAUCHI, Nigeria— The teenage girls entered the busy marketplace 
separately Tuesday, their vests of explosives hidden beneath their full 
hijabs.
The first detonated her bomb, 
killing three women. As rescuers rushed in, the second girl screamed and
 set off her explosives, killing dozens more, according to witnesses and
 authorities.
More than 40 
people died in the double suicide bombing in Maiduguri, a provincial 
capital in northeastern Nigeria, according to Haruna Issa, a hospital 
volunteer in the city.
Suspicion
 immediately fell on the insurgents from the Islamic militant group Boko
 Haram, which controls a large part of northeastern Nigeria and is 
blamed for the deaths this year of at least 1,500 people in Africa's 
most populous country.
                   In its
 campaign of violence, Boko Haram has used car bombs and men wearing 
vests of explosives. It also has begun using women who can cover the 
explosives with their hijabs, and the recruits appear to have gotten 
younger, with several instances of teenage attackers earlier this year.
The
 militants attracted international attention with their April kidnapping
 of more than 200 schoolgirls from Chibok, about 125 kilometers (78 
miles) southwest of Maiduguri. The schoolgirls are still missing and 
their plight has aroused international concern and prompted the 
#BringBackOurGirls social media campaign.
                  On Oct. 17, the parents of
 the schoolgirls were encouraged when the Nigerian military announced a 
cease-fire with Boko Haram and said negotiations had begun for the 
release of the captives.
Those hopes were quickly dashed when Boko
 Haram fighters continued attacks and seized several cities and towns 
across the northeast. In a video statement, Boko Haram leader Abubakar 
Shekau denied the cease-fire and scoffed at claims of negotiations to 
release the schoolgirls.It was not known if Tuesday's attackers were connected with the April abduction. A worker with a nongovernmental organization said young women in northern Nigeria are especially vulnerable to recruitment by the extremist group. The worker spoke on condition of anonymity because she feared for her safety.
The coordinated bombings by the two girls dressed in full hijabs took place as the marketplace was crowded with shoppers, said Abba Aji Kalli, the coordinator of the Civilian Joint Task Force in Borno state.
The first girl set off her explosives, while the second apparently waited until the rescuers rushed in to help before detonating her bomb, killing another 30 people, Kalli said.
"I am right here at the 
scene, and I have before me 11 corpses. ... Many have been taken away by
 relatives, while others are taken to the state specialists' hospital," 
he added.
On July 2, a car bomb in the same market killed 56 people.
Maiduguri,
 the largest city in Borno state and the birthplace of Boko Haram five 
years ago, is home to a Nigerian military headquarters. So far, the 
government troops have been unable to halt the bloodshed in the city and
 surrounding areas.
Borno is one of the three states in northeastern Nigeria that are under a state of emergency because of the extremist violence.
             In a new strategy, Boko Haram is seeking to form a caliphate, mimicking the Islamic State group.
Boko
 Haram still holds many centers in an area covering an estimated 20,000 
square kilometers (7,700 square miles) and has said it is imposing a 
strict version of Shariah law. The insurgents want to impose Islamic 
rule over all Nigeria, whose 170 million people are about evenly divided
 between Christians and Muslims.
    
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