"While living in Northern Virginia, Mohamed was a recruiter and radicalizer for al-Shabaab, which historically has targeted Westerners to go to Somalia and fight for them," FBI agent Carl Ghattas' statement was quoted as saying by CBS News.
According to the FBI data, Mohamed, a Somali-born US citizen, is thought to have left the United States on July 5, 2012, or at a time around that date. He was traveling with a US passport.
No extradition information for the suspect has been made available.
Ghattas stated that Mohamed was knowledgeable of the Washington, DC, area infrastructure, which made him valuable to other terrorists planning to carry out attacks in the United States.
Al-Shabaab, a clan-based militant group linked to international terrorist organization al-Qaeda, violently took over most of southern Somalia in 2006, expanding its insurgency and carrying out frequent gunfire and suicide attacks.