KABUL-Suicide bombers struck the main U.S. military base in Afghanistan on Wednesday, killing at least one person and injuring scores in a major attack that could scupper plans to revive peace talks between the United States and the Taliban.

The Taliban claimed responsibility for the attack, which struck the Bagram air base north of Kabul.

“First, a heavy-duty Mazda vehicle struck the wall of the American base,” said Zabihullah Mujahid, a Taliban spokesman. “Later several mujahideen equipped with light and heavy weapons were able to attack the American occupiers.”

The Taliban spokesman claimed the attack was still ongoing. The U.S.-led military coalition said the attack was “quickly contained and repelled”.

Abdul Shukoor Qudosi, the district governor of Bagram district, said 87 people were injured and one woman was killed, and that a clearance operation was still ongoing.

Five servicemen from the former Soviet republic of Georgia, which is part of the U.S.-led coalition, were among those injured, the country’s defence ministry said in a statement. The majority of casualties were Afghan.

“A 30-minute clash also happened between the attackers, who obviously wanted to enter the base, and foreign forces,” said Wahida Shahkar, a spokeswoman for the governor of Parwan province, which includes the Bagram district.

Two attackers detonated vehicles laden with explosives at the southern entrance to the base, while five more opened fire. It was not immediately clear how many of the five gunmen were killed, Shahkar said.

A medical base being built for locals was badly damaged, the coalition of foreign forces in Afghanistan said in a statement. The Taliban denied this.

U.S. President Donald Trump called off talks with the Taliban in September after an attack by the group killed an American soldier. The Taliban controls more territory than at any point since being ousted from power by Afghan foes with U.S. air support in 2001.

The attacker struck the facility that is being built to help the Afghan people who live in the area, the U.S. military said.

A U.S. spokesman said in a subsequent statement, several hours later, that some armed attackers remain inside the medical facility and that while still ongoing, the situation is isolated to the clinic building. The Bagram airfield is not in danger, added Col. Sonny Leggett.

The spokesman also said that the Bagram air base perimeter was never breached but that some U.S. service members were evaluated for minor injuries as a result of the initial attack.

The Taliban control or hold sway over nearly half of Afghanistan, staging regular attacks that target foreign and Afghan forces, as well as Kabul government officials, but also kill scores of civilians. Outside the sprawling base, several homes, mostly belonging to the poor, were destroyed. A large mosque in the area was also badly damaged.

Shortly after the bombing, Afghan troops, special forces and intelligence officers cordoned off the perimeter of the base with armored personnel carriers. Heavily armed soldiers kept residents far from the base gates.

Within minutes of the suicide bombing, U.S. fighter aircraft bombed the area, according to witnesses. Earlier reports suggested that a U.S. military convoy might have been the target of Wednesday’s attack.

Dr. Abdul Qasim Sangin, a physician who heads the main hospital in the province, said the hospital near the perimeter of the base was on fire. It wasn’t immediately clear if any foreigners were inside the hospital.