Northolt via Hamburg to RAF Gatow in Berlin collided during its approach to RAF Gatow with a Soviet Air Force Yakovlev Yak-3 fighter which had been flying dangerously close while performing aerobatics in the area at the time. As a result of the collision, the Viking spiralled out of control and crashed from the airport on East German territory killing all 14 on board. The Soviet fighter pilot was also killed. The accident happened during a period of heightened Cold War tensions over Berlin when Soviet military aircraft frequently "buzzed" Western commercial aircraft inside the Allied air corridors. A British inquiry determined that the Soviet pilot's action, which contravened all accepted rules of flying and the specific quadripartite flying rules to which the Soviets were party, was the cause of the accident. The Soviets rejected these findings and blamed the British flightdeck crew instead.<ref>Gatow Air Crash – Soviet Criticisms and Demands" The Times 23 April 1948 p. 3</ref> On 21 April 1948, Flight S200P, a Vickers Viking 1B (G-AIVE), crashed into Irish Law Mountain on approach to Renfrew Airport, Scotland. None of the 20 passengers and crew were killed in the accident but 13 were injured and the aircraft was written off. On 30 July 1948, Douglas Dakota C.3 G-AGIX flying from Edinburgh to London belly landed in a field near Sywell following engine problems. All on board survived. On 19 February 1949, Douglas C-47A G-AHCW flying from Northolt to Renfrew collided in mid-air with Royal Air Force Avro Anson trainer VV243 near Coventry killing all 14 passengers and crew on both aircraft. Neither aircraft had seen the other despite clear weather, and the accident was blamed on neither maintaining an adequate look out. On 19 August 1949, Douglas C-47A G-AHCY crashed into a hill short of the flight's destination at Manchester Airport due to a navigation error and pilot error, killing 24 out of 32 passengers and crew. On 13 April 1950, Vickers Viking 1B G-AIVL "Vigilant" was on a flight from London-Northolt Airport to Paris over the English Channel near Hastings when a French passenger was suspected of making a suicide attempt after a bomb exploded in the rear toilet compartment, tearing a hole tall by wide in the fuselage. The flight returned to Northolt and landed safely. The passenger and a flight attendant were injured in the blast. The captain, Ian Harvey DFC, a former RAF Bomber