Officials say a suicide car bomber has wounded at least 20 people after detonating his vehicle at a checkpoint in Pakistan's northwest, the Associated Press reported.
It's the second major attack Thursday in the region, where al-Qaida and Taliban militants have found sanctuaries from which to plan 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.
The military says a firefight broke out afterward.
Abdullah Khan, an official at a major hospital near the Swat blast, said at least 20 wounded people were brought in for treatment.
An earlier suicide attack killed at least 17 people in the Bajur tribal region.