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A Pakistani government official, who also spoke on condition of anonymity Wednesday, said Pakistani officials had stepped up the search for suspected militants in the past two weeks.

“We are actively working with the Americans and British to stamp out these militants,” he told the AP.

A suspected American missile strike killed four militants in northwest Pakistan on Tuesday, intelligence officials said. There was no word on the identities of those killed in the attack in the South Waziristan region, just across the border from Afghanistan. The Pakistani army last year launched a major anti-militant offensive in the region, though insurgents remain.

The counterterrorism official, who is familiar with the drone strikes and the details of the Europe terror plots, said Tuesday that the missile strikes in Pakistan are “a product of precise intelligence and precise weapons. We’ve been hitting targets that pose a threat to our troops in Afghanistan and terrorists plotting attacks in South Asia and beyond.”

The official acknowledged that “our operational tempo has been up for a while now” and added that, “given the stakes involved, we hope to keep the pressure on as long as we can.”

Associated Press writers Angela Charlton in Paris, Daniel Woolls in Madrid and Adam Goldman in Washington contributed to this report.