Amid rising insurgency in Pakistan, the United Nations' World Food Program (WFP) has shut down its distribution centers in the country's north-west over security concerns.

"We have closed all our food distribution centers in Swabi, Charsadda, Mardan, Swat, Buner, Dir and Bajaur which are the humanitarian hubs for internally displaced people in the region," a spokesman for WFP said in Islamabad on Wednesday.

This comes after a WFP center was attacked in the capital Islamabad earlier this month. Five people were killed in the strike.

The UN agency handed out food to more than two million people in the Swat Valley and its adjoining districts.

Most of the people were displaced by the fighting between the military and militants in the region.

This is while, the UN says the renewed fighting in South Waziristan could force up to 250,000 people to flee their homes.

JR/MMN