Three suspected foreign militants were arrested after a shootout with Pakistani forces in a remote tribal region near Afghanistan (search), a security official said Saturday.

The suspects opened fire from a car Friday when security forces asked them to halt, said the official who spoke on condition of anonymity because he is not authorized to speak to media.

A bystander was killed and her son wounded by stray bullets during the clash near Miran Shah, the main town in the northwestern region of North Waziristan (search), the official said.

The suspects' identity and nationality were not knowny available for comment.

Pakistan is a key ally of the United States in its war on terror. Last week it imposed a nighttime curfew in tribal areas to stop remnants of Taliban (search) and Al Qaeda from crossing over to Pakistan or going back to Afghanistan.

Earlier Friday, Pakistani President Gen. Pervez Musharraf (search) told The Associated Press that Islamabad has proposed setting up a barbed-wire fence along the Afghan border to help keep militants from crossing freely.

Pakistan has already deployed about 80,00 troops near Afghanistan to flush out militants.