DERA ISMAIL KHAN, Pakistan — A suicide bomber attacked police in northwest Pakistan on Sunday as they rushed to treat civilians injured by an earlier explosion, killing seven people and wounding at least 25 others, a police official said.
The bomber attacked police while they were investigating a minor blast in the town of Dera Ismail Khan near the Afghan border, Sanaullah Khan said.
Five police officials and two civilians were killed by the second blast and 16 police officials were among the wounded, Khan said.
Amanullah Khan, a wounded police official, said he and his colleagues were attending to four civilians injured by the first explosion when the bomber attacked.
"When I stood up, there was blood everywhere," he said. "My colleagues were crying with pain."
Local television showed smoldering bicycles, broken furniture and torn police uniforms splattered with blood littering the ground in front of shops destroyed in the attack. The footage also showed a police van damaged by the blast.
"This is the work of antistate and anti-Islamic forces," said local parliamentarian Khalifa Abdul Qayoum. "We are not afraid of them. We will fight them."
Following the attack, unknown gunmen opened fire on an ambulance carrying one of the dead back to his home village, wounding three people, said police official Jehangir Khattak.
Many al-Qaida and Taliban militants fled to northwest Pakistan from Afghanistan after the U.S.-led invasion in 2001. The militants have regrouped and have been launching attacks against Western forces across the border in Afghanistan and against security forces and civilians inside Pakistan.
During a raid elsewhere in northwest Pakistan on Sunday, the army discovered a van packed with 880 pounds of explosives. The van was intended to be used in a suicide bombing, the army said. Six suspected militants were arrested in the raid.