Investigators hunted for clues Tuesday that would help explain why an Indonesian jetliner crashed seconds after takeoff, sifting through body parts as they worked. Weeping families looked for loved ones among dozens of charred bodies lying outside a morgue, The Associated Press reported. At least 149 people were killed when the Boeing 737-200 crashed Monday in Indonesia's third largest city of Medan, including 47 people on the ground, a hospital official said Tuesday after tallying the corpses. Fifteen people aboard the flight survived, including an 18-month-old boy who was shielded in his mother's arms. Transport Minister Hatta Rajasa said it would be several weeks before the cause of the crash was known, but that investigators would be looking at why the Mandala Airlines plane failed to take off properly. The flight data recorder has been found, officials said.