A pilot error or a technical fault — not terrorism — is likely to be the cause of the plane crash into the Black Sea, Russia's transport minister said Monday as the nation held a day of mourning for the victims. All 84 passengers and eight crew members on the Russian military's Tu-154 plane are believed to have died Sunday morning when it crashed two minutes after taking off from the southern city of Sochi. The passengers included dozens of singers in Russia's world-famous military choir, nine Russian journalists and a Russian doctor known for her charity work in war zones. On Monday, the search operation involved more than 3,500 people on 45 ships — including 135 divers flown in from across Russia — sweeping a vast crash site at sea and along the shore, according to the Defense Ministry. Five helicopters and drones were being used to help spot bodies and debris. Two deep-water submersibles arrived on Monday in Sochi to aid the operation, which went on all through the night thanks to powerful searchlights. The Black Sea search area — which covers over 10 sq km — is plagued by underwater currents that can carry debris and body fragments into the open sea. The search party has not yet found the plane's black boxes, Emergency Situations Minister Vladimir Puchkov told Russian news agencies. Transport Minister Maxim Sokolov said earlier that the plane's flight recorders did not have radio beacons, so locating them on the seabed was going to be challenging. Speaking on television Monday, Sokolov said that terrorism was not among the main theories for the crash cause, and that authorities were looking into a possible technical fault or a pilot error. Still, several aviation experts noted factors that could suggest a terror attack, such as the crew's failure to report any malfunction and the fact that debris from the plane was scattered over a wide area. "Possible malfunctions ... certainly wouldn't have prevented the crew from reporting them," Vitaly Andreyev, a former senior Russian air traffic controller, told RIA Novosti. The plane was taking the Defense Ministry's choir, the Alexandrov Ensemble, to perform at a New Year's concert at Hemeimeem air base in Syria's coastal province of Latakia. It had originated from Moscow's military airport of Chkalovsky and stopped in Sochi for refueling. Despite the Syrian connection, Sokolov said the government sees no need to heighten security measures at Russian airports. Emergency crews found fragments of the plane about 1.5 km from the shore on Sunday but a deputy defense minister told Russian news agencies that experts estimated the Tu-154 crash site at 6 km from the shore. By Monday morning, rescue teams had recovered 11 bodies as well as body fragments. All were flown to Moscow, where the remains will be identified. Local governor Veniamin Kondratyev told Russian state television that most of the bodies could be still inside the fuselage. On Monday, a nationwide day of mourning for the plane victims, red and white carnations piled up outside the Moscow office of the Alexandrov Ensemble. One singer who did not get on the plane for personal reasons said he was devastated at the loss of so many talented colleagues. Soloist Vadim Ananyev stayed behind to help his wife with the kids as they just had a new baby. — AP
