PESHAWAR, Pakistan (AP) - A suicide car bomber struck a police facility in an army cantonment in Pakistan's main northwest city early Wednesday, officials said, killing two people and wounding at least 22 in the latest attack in the country since the U.S. raid that killed Osama bin Laden.

Though no group immediately claimed responsibility for the early morning strike in Peshawar, it added to growing fears that it will be a bloody summer as Pakistani Taliban and other al-Qaida affiliated groups carry out threats to avenge the al-Qaida chief's slaying.

Already this month, the Pakistani Taliban have claimed they carried out three revenge attacks, including a deadly 18-hour siege of a naval base.

The bomber's target Wednesday appeared to be a building belonging to the police's criminal investigation department, but Pakistani army facilities also are nearby, said Liaquat Ali Khan, a senior police official in Peshawar.

Khan said at least 2 people died and that of the 22 wounded, four were in serious condition. A handful of others were believed missing, possibly in the rubble of the collapsed building. Military forces quickly sealed off much of the cantonment as machines were brought in to sift through the facility's wreckage.

"Our determination is much higher than before, and we will fight till the defeat of these terrorists," said Bashir Bilour, a senior official with the provincial government.

Bin Laden was killed on May 2 by a team of U.S. Navy SEALs in the army town of Abbottabad, elsewhere in Pakistan's northwest and near Pakistan's premier military academy.