JAKARTA, Indonesia (AP) -- An explosion outside a Marriot Hotel in downtown Jakarta killed four people on Tuesday, radio reports said. It was not immediately clear whether the blast was caused by a bomb. However, since last year's terrorist bombings in Bali, which killed 202 people, authorities have warned that more attacks were likely. "I saw four badly burned bodies on the street," a reporter from Jakarta's El Shinta radio station said, adding that two cars nearby were on fire. Brig. Gen. Edward Aritonang, a police spokesman, said he had heard the report and that officers were on their...