Russian news agency says remains of bomber to be examined . Russia authorities say preliminary information points to a female suicide bomber . The head of the committee , Vladimir Markin , said 16 people had been killed and 34 people were injured , including a 9-year-old girl . The U.S. military has said it is investigating the possibility that an American plane was shot down over eastern Ukraine on Thursday and its crew members were killed in what appears to have been a friendly fire incident. Bomber reportedly was approaching metal detector when attack occurred .
Russian news agency says remains of bomber to be examined . Russia authorities say preliminary information points to a female suicide bomber . The U.S. military has said it is investigating the possibility that an American plane was shot down over eastern Ukraine on Thursday and its crew members were killed in what appears to have been a friendly fire incident. Bomber reportedly was approaching metal detector when attack occurred .