The Taliban has threatened the US and NATO with consequences if the promised military withdrawal from Afghanistan is not completed by May 1 after US President Joe Biden said the exit would not be completed until September 11. Biden announced on Wednesday the withdrawal of 2,500 US troops would not be completed until September 11, the 20th anniversary of the 9/11 attacks. Taliban spokesman Zabiullah Mujahid said those responsible for delaying the removal of US and NATO troops from Afghanistan would be 'held liable'. Writing on Twitter, Mujahid said: 'If the [Doha] agreement is breached and foreign forces fail to exit our country on the specified date, problems will certainly be compounded and those whom failed to comply with the agreement will be held liable'.