One of Abousamras distinguishing characteristics is his higher-pitched voice, which can be heard on the FBIs website. He also has dual U.S. and Syrian citizenship, is fluent in English and Arabic, and has a college degree in computer technology.
Abousamras co-conspirator, Taerk Mehanna, was convicted of terrorism charges by a federal jury in December 2011. He was sentenced last year to more than 17 years in prison.
Both men were radicalized and used the Internet to educate themselves, said Special Agent Heidi Williams, a member of the Joint Terrorism Task Force (JTTF) in Boston. They came to it independently, but once they found each other, they encouraged each others beliefs.
Both Abousamra and Mehanna were inspired by the Sept. 11, 2001, terror attacks, she said.
They celebrated it, Williams said.