Iran partially reopened its airspace today to international flights crossing the eastern part of its territory, the country's Civil Aviation Authority said.

"Air routes in the eastern section of the country's airspace are open for international flights transiting through Iran," it said, adding that some airports had also reopened at 7:00am (0330 GMT).

More than three hours later, however, flight tracker websites still showed no international flights crossing Iran, and several were avoiding its airspace by making long detours.