KHAR, Pakistan — A suicide bomber killed at least 26 people and wounded many others Saturday in an attack on a food distribution center in the northwest of the country, officials said.

Islamist militants battling the state have attacked buildings handing out humanitarian aid in Pakistan before, presumably because they are symbols of the government and Western influence.

The bomber blew himself up at a security post close to the relief center in the town of Khar in the Bajur region, close to the Afghan border, said local administrator Sohail Khan.

He said the distribution center was used by the World Food Program and other agencies to distribute food to conflicted-affected people in the region.

The 26 victims were believed to be waiting for food, he said.

Pakistan has been rocked by over 200 suicide bombings over the last three years, especially in the northwest.