An explosion that blew a hole in a jetliner shortly after takeoff and left one man missing was believed to have been caused by a bomb, the pilot said Wednesday, describing how the crew calmed frightened passengers as smoke enveloped the cabin before he brought the plane back to Mogadishu's airport for an emergency landing. Residents of Balad, a town 30 kilometers (about 18 miles) north of Mogadishu, found the body of a man who might have been blown out of the Airbus 321 in Tuesday's blast, said police officer Mohamed Hassan.