NTSB would investigate. They investigate all disasters and bombings. Even the one the US did in the straits of Hormuz, which ended up killing 290 passengers, including 66 children in 1988.
http://en.wikipedia.org/wiki/Aviation_accidents_and_incidents
The deadliest aviation-related disaster of any kind, considering fatalities on both the aircraft and the ground, was the destruction of the
World Trade Center in
New York City on
September 11, 2001 with the intentional crashing of
American Airlines Flight 11 and
United Airlines Flight 175 by Al-qaeda terrorists. The crashes killed 2,988, most of them occupants of the World Trade Center towers or emergency personnel responding to the disaster.
The March 27, 1977,
Tenerife disaster remains the accident with the highest number of airliner passenger fatalities. In this disaster, 583 people died when a
KLM Boeing 747 attempted take-off and collided with a taxiing
Pan Am 747 at
Los Rodeos Airport. Pilot error, ATC error, communications problems, fog, and airfield congestion due to a bombing and a second bomb threat at another airport, which diverted air traffic to Los Rodeos, all contributed to this catastrophe.
The crash of
Japan Airlines Flight 123 in 1985 is the single-aircraft disaster with the highest number of fatalities. In this crash, 520 died on board a
Boeing 747. The aircraft suffered an
explosive decompression from a failed pressure bulkhead repair, which destroyed its vertical stabilizer and severed hydraulic lines, making the 747 virtually uncontrollable.
The world's deadliest
mid-air collision was the
1996 Charkhi Dadri mid-air collision involving
Saudia Flight 763 and
Air Kazakhstan Flight 1907 over
Haryana,
India. The crash was mainly the result of the Kazakh pilot flying lower than the altitude for which his aircraft was given clearance. Three hundred and forty-nine passengers and crew died from both aircraft. The
Ramesh Chandra Lahoti Commission, empowered to study the causes, also recommended the creation of "air corridors" to prevent planes from flying in opposite directions at the same altitude.
On March 3, 1974,
Turkish Airlines Flight 981 McDonnell Douglas DC-10 crashed in a forest northeast of Paris, France. The destination was London but the plane crashed shortly after taking off from Orly airport. There were a total of 346 people on board; all of them perished in the crash. It was later determined that the cargo door had detached which caused an explosive decompression which in turn caused the floor just above to collapse. When the floor collapsed it severed the control cables, which left the pilots without control of the elevators, the rudder and the No. 2 engine. The plane entered a steep dive and crashed. It was the deadliest plane crash of all time until the Tenerife disaster in 1977.
On June 23, 1985,
Air India Flight 182 crashed off the southwest coast of Ireland when a bomb exploded in the cargo hold. On board the
Boeing 747-237B were 307 passengers and 22 crew members, all of whom were killed when the plane disintegrated. One passenger checked in as "M. Singh". He didn't board the flight but his suitcase that contained the bomb was loaded onto the plane. Mr. Singh was never identified and captured. It was later found out that
Sikh extremists were behind the bombing and that it was a retaliation for the Indian government's attack on the sacred Golden Temple in the city of
Amritsar, which is very important for the Sikhs. This was at the time the deadliest terrorist attack involving an airplane.
On September 1, 1983, a Soviet
Sukhoi Su-15 shot down
Korean Air Lines Flight 007 killing all 269 passengers and crew
[1].
Iran Air Flight 655 was a civilian airliner shot down by US missiles on Sunday 3 July 1988, over the
Strait of Hormuz killing all 290 passengers and crew aboard, including 66 children, ranking it seventh among the deadliest airline disasters.
Pan Am Flight 103 was a Boeing 747-121 that was destroyed by a terrorist bomb over the town of
Lockerbie, Scotland on the 21st December 1988. The crash killed all 243 passengers, all 16 crew and 11 people on the ground (all of whom were residents of Sherwood Crescent, Lockerbie), making it the worst terrorist attack involving an aircraft in the UK.