A breakaway Afghan Taliban faction has appointed its own leader, underlining deep divisions in the group following the death of founder Mullah Omar.

U.S. President Barack Obama urges Pakistan to avoid developments in its nuclear weapons programme that could increase risks and instability.

A dispute that threatened to split the Afghan Taliban has been resolved after relatives of late leader Mullah Omar backed his successor, the group says.

The Afghan Taliban have confirmed covering up their former leader Mullah Omar's death for more than two years.