Smoke billowed from a chemical-carrying Panamanian containership berthed at a Tokyo pier Monday, raising fears of a possible leak of toxic gases and other substances, the Tokyo Fire Department said.The smoke from the 16,584-ton Uni Vital may have been caused by a chemical reaction between air and about six tons of poisonous organic peroxide compound the ship is believed to be carrying, the department said.The ship, which originated from Indonesia with a crew complement of 21, was scheduled to leave for Nagoya port via Yokohama port later in the afternoon. It is berthed at Aomi Pier in Koto Ward, the department said. There were no immediate reports of injuries.