Salim

NAIROBI, Kenya (CNN) -- A spokesman for the United States Embassy in Nairobi tells CNN that one of the primary suspects in the terror attack on the embassy is being flown to the United States.

The man, identified as Khalid Salim, is suspected of throwing a grenade at embassy guards just prior to the bombing. Previously, he had been identified as Mohammed Khalid.

Sources close to the investigation tell CNN at least one witness identified Salim as the man who threw the grenade. Salim was allegedly one of at least three people in a truck believed to have held the bomb.

The other two men are thought to have died in the blast. Salim sustained minor injuries

Kenyan authorities say Salim was arrested in Nairobi August 7, the day of the bombing. Under Kenyan law, a suspect can only be held 21 days without being charged formally with a crime.

Although he has not been charged, Salim is being transported to the U.S.

Washington has held Saudi dissident Osama bin Laden responsible for the bombings of U.S. embassies in Kenya and Tanzania which killed more than 250 people, including 12 Americans, and injured thousands.