U.S. Vows Action against Pakistan-Based Insurgents

Defense Secretary Leon Panetta on Wednesday warned the United States would retaliate against insurgents based in Pakistan blamed for staging a dramatic attack in the Afghan capital.

A day after a 19-hour assault staged near the U.S. embassy and NATO headquarters, Panetta expressed frustration that the Pakistani government has so far failed to crack down on Haqqani network militants that Washington suspects carried out Tuesday's attack.

"Time and again we've urged the Pakistanis to exercise their influence over these kinds of attacks from the Haqqanis and we've made very little progress in that area," Panetta told reporters aboard his plane before landing in San Francisco.

"I'm not going to talk about how we're going to respond. I'll just let you know that we're not going to allow these kinds of attacks to go on," he said.

Panetta's tough words come amid strained relations with Islamabad following the U.S. raid that killed Osama bin Laden at his Pakistani hideout on May 2, a raid that Panetta oversaw while he was CIA director. Islamabad's leaders had no advance word of the secret operation, which has caused anger and soul-searching in Pakistan.

As head of the Central Intelligence Agency, Panetta also presided over a dramatic expansion in drone bombing raids in Pakistan, with robotic aircraft targeting al-Qaida and Taliban militants in the country's northwest tribal areas.

U.S. officials have for years demanded Islambad move against the Haqqani network, which operates in part out of sanctuaries inside Pakistan's borders.

Before the Kabul attack, the U.S. military blamed the Haqqani militants for a truck bombing on Saturday against a NATO base in Wardak province that wounded 77 American troops.

The 19-hour Taliban assault on Kabul turned the city's most heavily secured district into a battle zone. Fifteen people were killed and six foreign troops wounded in the attack.