Ukrainian jet that crashed in Tehran 'WAS hit by an Iranian missile in what was likely an accident, Pentagon and US intelligence officials say'
CCTV shows the burning plane lighting up a street before exploding in a fireball
Separate footage from a car appears to confirm the plane was already on fire
The Boeing jet suffered a fault in mid-air and tried to turn back, investigators say
Iranian officials say the crew did not send a radio message to report the danger
Ukraine is sending missile experts to look for evidence of a possible shoot-down
The plane disappeared from radar screens at 8,000 feet and crashed into a field
All 176 people on board were killed, including three Britons and 73 Canadians