Two youths suspected of stealing and then selling up to 10 luxury cars in the West Los Angeles area were arrested after police found them driving a stolen car, authorities said. The two youths, ages 16 and 17, are suspected of stealing Porsches, Mercedes-Benzes, Cadillacs and other luxury cars since July, Los Angeles Sheriff's Sgt. John Andrews said. Sheriff's deputies and Culver City police found one of the youths driving a $60,000 Porsche Cabriolet that had been reported stolen earlier in Culver City, Andrews said. Police also found a 9-millimeter handgun in the Porsche, which may have been used by the suspects to steal the cars from the owners, he said.