Pakistani officials say militants overnight ambushed security forces who were responding to an earlier attack on aid trucks in the country's troubled northwest, leading to a shootout in which four troops were killed.

The Afghan embassy in Islamabad says Pakistan wants to remove all Afghan refugees from the country and they face expulsion in the near future

Afghan refugees are facing arrests and harassment in Pakistan as part of a mass expulsion campaign, Kabul's embassy in Islamabad said on Wednesday, after the U.N.'s refugee agency said hundreds had been expelled from two cities.

Pakistani authorities have stepped up arrests of Afghan citizens in Islamabad and the nearby city of Rawalpindi and are forcing them to move elsewhere in Pakistan