The Taliban have launched a new large-scale attack on one of Afghanistan’s main cities, Kunduz, and taken hospital patients as hostages, the government said Saturday, even as the insurgent group continued negotiations with the United States on ending America’s longest war.

The militants, who have demanded that all foreign forces leave Afghanistan, now control or hold sway over roughly half of the country and are at their strongest since their 2001 defeat by a U.S.-led invasion. Such attacks are seen as strengthening their negotiating position.

Presidential spokesman Sediq Seddiqi said Afghan security forces were repelling the attack in parts of Kunduz, a strategic crossroads with easy access to much of northern Afghanistan as well as the capital, Kabul, about 200 miles (335 kilometers) away.

Seddiqi told reporters that the assault was “completely against the peace talks” and asserted that the militants were sheltering among civilians.

The Taliban were in control of the hospital in Kunduz and both sides in the fighting had casualties, provincial council member Ghulam Rabani Rabani told The Associated Press. He could not give an exact number.

The militants had taken hospital patients as hostages, defense ministry spokesman Rohullah Ahmadzai told reporters. He did not say how many.

“We could very easily attack but we don’t want civilian casualties,” he said. Hospital officials could not immediately be reached.

Ahmadzai asserted that 26 Taliban fighters had been killed in an airstrike but did not mention any casualties among civilians or Afghan security forces.

The Taliban launched the “massive attack” from several different points around the city overnight, said Sayed Sarwar Hussaini, spokesman for the provincial police chief.

“I can confirm that intense gun battles are going on around the city, but the Taliban have not been able to overrun any security checkpoint,” he said. Reinforcements had arrived and Afghan air forces were supporting ground forces, Hussaini said.

Officials with the NATO mission in Afghanistan did not immediately respond to a question about whether its forces were responding to the attack.

The Taliban have continued bloody assaults on civilians and security forces even as their leaders meet with U.S. peace envoy Zalmay Khalilzad in Qatar to negotiate an end to nearly 18 years of war.

Talks continued on Saturday, the Taliban spokesman said. Both sides in recent days have signaled they are close to a deal. The Afghan presidential spokesman said Khalilzad will visit Kabul at some point to brief the government on the details.

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