Thousands of homeless Iranians huddled against the cold, a day after at least 450 people have been killed in Iran's deadliest earthquake in more than a decade, state TV says.

More than 400 people have been killed in Iran when a magnitude 7.3 earthquake jolted the country, state media says, and rescuers have been searching for dozens trapped under rubble in the mountainous area. At least six have died in Iraq as well.