Police in Pakistan say a suicide car bomber attacked an army checkpost in the country's northwest, killing four soldiers.

Pakistan, Afghanistan, SWAT Valley, map

The attack took place Monday in the Khawaza Khela area of the restive Swat Valley.

Officials say at least three other people were also wounded in the blast.

Militants control large parts of the Swat valley region. 

Government officials signed a peace agreement in May with militants in Swat to try to end months of fighting that began in late 2007.  Soon after it was signed, militants resumed burning schools and blowing up barbershops, and the government stepped up anti-insurgent operations. 

Pakistani security forces are said to have killed up to 2,000 militants since early August in the Swat district and the Bajaur tribal region on the Afghan border. 

Some information for this report was provided by AFP and AP.