The men are not considered suspects at this time , a Pakistani police official says . A U.S. law enforcement source tells CNN that the FBI is investigating whether there was any connection between the two men. He is identified as Warren Weinstein , the U.S. Embassy says . Weinstein is a Fulbright Scholar in Belgium and is proficient in six languages , with a doctorate in international law and economics , according to his company website . There has been no claim of responsibility , or demands .
The men are not considered suspects at this time , a Pakistani police official says . A U.S. law enforcement source tells CNN that the FBI is investigating whether there was any connection between the two men. He is identified as Warren Weinstein , the U.S. Embassy says . There has been no claim of responsibility , or demands .