Pakistani police and troops fired warning shots Tuesday as people who have fled a military operation against the Taliban protested over food shortages.
People blocked the main road from Bannu to Khyber-Pakhtunkhwa provincial capital Peshawar.
The World Food Program began distributing aid on Monday, but there was anger among refugees at long delays.
More than 450,000 people have fled ahead of an impending ground assault, after the Northwestern tribal area of North Waziristan was hit by more than a week of shelling and air raids.
