Dhaka, Sept. 18 -- A drone strike in Kabul last month killed as many as 10 civilians, including seven children, the US military said on Friday, apologising for what it called a "tragic mistake".

The Pentagon had said the Aug 29 strike targeted an Islamic State suicide bomber who posed an imminent threat to US-led troops at the airport as they completed the last stages of their withdrawal from Afghanistan.

Even as reports of civilian casualties emerged, the top US general had described the attack as "righteous", reports Reuters.

The head of US Central Command, Marine Corps General Frank McKenzie, said that at the time he had been confident it averted an imminent threat to the forces at the airport.

"Our investigation now concludes that...