Officials say a suicide car bomber has wounded at least 20 people after detonating the vehicle at a checkpoint in Pakistan's northwest, the Associated Press reported.
It was the second major suicide attack Thursday in the region, where the al-Qaida and Taliban militants are shelting and planning attacks in neighboring Afghanistan.
The car bombing occurred near a police compound in the Mingora area of the Swat Valley, a once-popular tourist destination now riddled with violence.
A firefight broke out afterward, according to the military.
Abdullah Khan, an official at a major hospital near the Swat blast, said at least 20 wounded people were brought in for treatment.
The earlier attack killed at least 17 people in the Bajur tribal region.