Pakistani authorities have arrested four men believed to be al-Qaeda suspects in an area close to the Afghan border, reports say.
The men are said to have been picked up during an overnight raid in the North West Frontier Province.
Information minister Sheikh Rashid told the AFP news agency that “explosives, timer devices and computers” were seized from suspects.
Hundreds of foreign militants are thought to be hiding in the region.
Reports say the arrested men held foreign passports.
More than 100 militants and troops were killed during a major operation against suspected al-Qaeda members in March.
An amnesty deal for foreign militants in Pakistan’s Afghan border region suffered a setback when they failed to begin a planned registration.
Under the deal, the fighters would be able to stay if they halted activities against Pakistan and Afghanistan.
Pakistan has now given local tribesmen who brokered the deal more time but said they might face legal action if they fail to deliver on their promises.