WASHINGTON  The White House has backed away from using American commandos for further ground raids into Pakistan after furious complaints from its government, relying instead on an intensifying campaign of airstrikes by the Central Intelligence Agency against militants in the Pakistani mountains.

According to American and Pakistani officials, attacks by remotely piloted Predator aircraft have increased sharply in frequency and scope in the past three months.

Through Sunday, there were at least 18 Predator strikes since the beginning of August, some deep inside Pakistan’s tribal areas, compared with 5 strikes during the first seven months of 2008.

At the same time, however, officials said that relying on airstrikes alone, the United States would be unable to weaken Al Qaeda’s grip in the tribal areas permanently. Within the government, advocates of the ground raids have argued that only by sending Special Operations forces into Pakistan can the United States successfully capture suspected operatives and interrogate them for information about top Qaeda leaders.