(Reuters) - A large explosion was heard in Kabul late on Thursday as the U.S. military destroyed ammunition, Taliban spokesman Zabihullah Mujahid said on Thursday.

       Two witnesses in an area some 3-4 kilometres from the airport said earlier they had heard a huge explosion, hours after an Islamic State suicide attack killed dozens of people trying to board evacuation flights.

       (Reporting by James Mackenzie; Editing by Leslie Adler)