Islamabad, Pakistan ? Despite battlefield losses suffered against U.S.-led forces in Afghanistan, the al-Qaida network of Osama bin Laden remains capable of carrying out terrorist acts, a U.S. military spokesman said Sunday.

Navy Cmdr. Frank Merriman, a U.S. Central Command spokesman, said the U.S.-led military campaign in Afghanistan has scored significant victories against al-Qaida but that the global terrorist organization is far from being wiped out. Pockets of enemy fighters are believed to be hiding in Afghanistan and Pakistan, waiting for the right moment to strike.

“Central Command would never say al-Qaida and the Taliban have lost their effectiveness,” Merriman said. “They are a worldwide organization. There very well may be other terrorist acts in the planning process, and our goal is to try to disturb and eliminate as many of those as we can.”

An indication the terrorist threat still exists was underscored Friday, when the State Department ordered families and nonessential diplomatic workers at the U.S. Embassy and consulates in Pakistan to leave the country.

The departure order came less than a week after two Americans were killed in a grenade attack at a church in Islamabad, the capital, and just as 11 people were charged in a Pakistani court in the kidnapping and murder of Wall Street Journal reporter Daniel Pearl.

However, Taliban leaders and others familiar with the Islamic movement say as many as 1,000 Taliban and al-Qaida fighters who escaped from Afghanistan are hiding in lawless regions of Pakistan and are planning a comeback in Afghanistan. Others are believed still inside Afghanistan.

U.S. military and intelligence officials say al-Qaida and Taliban fighters in Pakistan’s North West Frontier Province, near the Afghan border, are expected to step up activity in the spring as weather improves.