Bessler spoke on a rooftop, overlooking the sprawling Jalozai refugee camp in western Pakistan.

CNN: Displaced Pakistanis crowd camps as they flee fighting

Jalozai has schools, a hospital and job training programs designed to help people prepare for their eventual return home.

WSJ: Bomb Strikes Pakistani Refugee Camp

Jalozai, about 30 kilometers (19 miles) southwest of Peshawar, is one of three camps in Pakistan for people displaced by the fighting in the northwest.

WSJ: Bomb Strikes Pakistani Refugee Camp

Attacks on refugee camps in Pakistan are extremely rare, although there have been concerns over the years that militants would try to infiltrate Jalozai and other camps.

BBC: Deadly car bomb hits Pakistan's Jalozai refugee camp

The residents of Jalozai Camp, 50 kilometres (30 miles) east of Peshawar, have yet to be granted refugee status by Pakistan, depriving them of most international relief.

BBC: Afghan refugees moved from border

Many of the refugees get rations from the United Nations' World Food Program, which feeds nearly 1 million people a month at Jalozai and other distribution points across the northwest.

WSJ: Bomb Strikes Pakistani Refugee Camp

The attack on the Jalozai camp underlines the intensity of the conflict in Pakistan's northwest, where refugees are sometimes caught in the middle of a battle between the government and militants.

WSJ: Bomb Strikes Pakistani Refugee Camp

The Jalozai camp, which lies on the outskirts of the main northwest city of Peshawar, hosts Pakistanis who have been displaced by fighting between the army and the Taliban in the country's northwest.

WSJ: Bomb Strikes Pakistani Refugee Camp

Tensions have been building in the Jalozai camp.

CNN: Displaced Pakistanis crowd camps as they flee fighting