Washington and Islamabad have said that Pakistan will reopen crucial supply routes to Nato-led forces in Afghanistan after the US apologised for killing 24 of its soldiers in November.

US Secretary of State Hillary Clinton said that they are sorry for the losses suffered by the Pakistani military.

The Pakistani Taliban promptly threatened to attack the convoys.

The routes are increasingly important, as NATO prepares to withdraw all combat troops from Afghanistan in 2014.

The row over the supply lines has been hugely damaging to relations between Pakistan and the US.