From ABC News: "The Boeing 737-800, which belongs to Ukraine International Airlines, crashed near Imam Khomeini International Airport and burst into flames after a fire struck one of its engines, said Qassem Biniaz, a spokesman for Iran's Road and Transportation Ministry. The pilot then lost control of the plane, sending it crashing into the ground, Mr Biniaz said, according to the state-run IRNA news agency."
Probably hard to work out if they're telling the truth if the only information is coming from the government who may or may not be responsible...
I also hope the missile story is only speculation but I think we may be in for some prolonged troubled times in the Middle East in any event, at least as long as Trump is in the White House. Just so horrible for the passengers and crew on board and their families.