Five women died late Saturday when a limousine heading to a bridal shower burst into flames on the San Mateo Bridge, trapping the victims inside while the driver and four other women escaped. The limo was going west on the bridge at about 10 p.m. when smoke began pouring out of the rear passenger area, the California Highway Patrol said Sunday. Emergency crews extinguished the blaze before it engulfed the entire vehicle, but the rear one-third of the white, 1999 Lincoln Town Car was left a charred ruin. Authorities said she and the other surviving women were being treated for moderate injuries. The survivors were being treated at Stanford Medical Center and Valley Medical Center in San Jose. Besides Guardiano and Arrellano, they were identified as 34-year-old Jasmine Desguia of San Jose and Amalia Loyola, 48, of San Leandro.