(CBS) A compound being used by U.S. special forces in central Afghanistan was attacked with small arms, U.S. officials said on Friday. There were no reported casualties from Thursday night's incident at the mud-walled compound in Tarin Kot, the capital of Uruzgan province.

Afghan soldiers working alongside special forces returned fire after the brief attack, said Col. Roger King.

Hostility toward U.S. military operations has increased in southern and central Afghanistan since a July 1 airstrike in which an AC-130 gunship raked a compound where members of an extended family were celebrating an imminent wedding.

Afghan officials said 48 people were killed, including 25 partygoers, who came from a family close to President Hamid Karzai. Another 170 people were injured. Afghan authorities said most of the dead were women and children.

Since the airstrike, American forces have come under attack several times in southern and central Afghanistan.

The day after the airstrike, a U.S. military convoy was fired on in Kandahar as troops were returning from the hospital where victims of the U.S. attack were undergoing treatment. One solider was shot in the foot but the assailant escaped.

U.S. special forces hunting al Qaeda and Taliban holdouts near the Pakistani border came under rocket fire a few days later near the eastern town of Khost.

On Thursday, a U.S. soldier was hit by a sniper's bullet while on patrol near the southern city of Kanadahar. The bullet skimmed off the soldier's helmet, but the impact gave him a concussion.

Nevertheless, King said he did not believe the level of violence against Americans and coalition forces had increased since the airstrike.

“I don't see any increase necessarily when you look across the county,” King told reports at Bagram air base, the U.S. headquarters for the war in Afghanistan.

“This is a dangerous place. We are in the middle of war. People do get shot at, but I don't necessarily say that there's been an increase or decrease in enemy activity over the short term,” he said.

Elsewhere, U.S. demolition teams destroyed a massive cache of weapons — detonating a tons of ammunition, mines and rockets in the town of Organ-E, he said. They destroyed about a million rounds of heavy machine gun ammunition, he said.

The weapons were found in several different areas near Organ-E and were old and not useful, he said.

In Pakistan, two Islamic militants accused in last month's deadly U.S. Consulate bombing were charged Friday with an earlier attempt to fire rockets at part of Karachi's airport used to supply international troops in Afghanistan, police said.

Mohammed Hanif and Mohammed Imran were accused of firing one 107 mm rocket and trying unsuccessfully to set off four others, police Superintendent Manzoor Mughal said.

The two did not enter a plea when they appeared before a magistrate Friday in Karachi, but had admitted being involved in the rocket attack to police, Mughal said.

Hanif and Imran were arrested in commando raids Monday on houses in Karachi and were charged in connection with the June 14 consulate bombing that killed at least 12 Pakistanis and injured 50 other people. The charges were the first stemming from a joint Pakistani and FBI investigation into the blast.

Hanif, Imran and a third man were also charged with attempted murder in a failed plot to assassinate President Pervez Musharraf with a bomb in April. The plot failed when explosives loaded into a car parked on Musharraf's route failed to detonate. Hanif confessed to the previously unannounced plot at a news conference Monday.

On Friday, Hanif and Imran were charged with firing a rocket on Feb. 16 at a terminal at Karachi's airport that at the time was being used by international forces to supply troops in Afghanistan. The rocket missed its target and hit a house 1½ miles from the airport, injuring two people, Mughal said.

On Feb. 18, authorities said they found four more rockets about a half-mile from the airport that were rigged with a homemade timer. Two of the rockets were pointed at the supply terminal and the other two at an airport hotel used as a barracks for troops.

Authorities have said Hanif and Imran are members of Harkat-ul-Mujahedeen al-Almi, a splinter group of Harkat-ul-Mujahedeen, or Movement of Holy Warriors, which worked closely with al Qaeda in Afghanistan before the collapse of Taliban rule last year.

Police said they believe the group also carried out the May 8 suicide bombing at the Sheraton Hotel in Karachi, in which 11 French engineers and three other people died.

Pakistan became a key U.S. ally in the war against terrorism after Musharraf cut ties with the Taliban following the Sept. 11 attacks in the United States.

Since then, Musharraf's government has faced a backlash from extremists, who accuse him of selling out to the West.