NBC, msnbc.com and news services report:
An Associated Press reporter with the rebels rapidly advancing toward Tripoli saw them take over the base of the Khamis Brigade, 16 miles west of the capital. After a brief gunbattle, Gadhafi's forces fled.
Gadhafi's 27-year-old son Khamis commands the 32nd Brigade, also known simply as the Khamis Brigade, one of the best trained and equipped units in the Libyan military.
Inside the base, hundreds of rebels cheered wildly and danced, raising the rebel flag on the front gate of a large, gray wall enclosing the compound. They seized large stores of weapons from the base, driving away with truckloads of whatever arms they could get their hands on. One of the rebels carried off a tube of grenades, while another carted off two mortars.
Read more about developments in Libya and the rebels' advance on Tripoli here.