Two American service members were killed fighting the Taliban near the northern city of Kunduz on Thursday, the U.S. military said amid reports that air strikes called in to protect the troops had caused heavy civilian casualties.
Although the U.S. military gave no details, Afghan officials said there had been heavy fighting overnight about 5 km (3 miles) from the city center, which Taliban fighters succeeded in entering as recently as last month, and air strikes had caused many casualties.
There were angry protests by civilians who brought the bodies of at least 16 dead into Kunduz, Mafuzullah Akbari, a police spokesman said. Some reports put the death toll higher but there was no immediate official confirmation.
See more on the conflict in Afghanistan:
The past 15 years at war in Afghanistan
The past 15 years at war in Afghanistan
The United States and Britain on October 7, 2001 launched a first wave of air strikes against Afghanistan and President George W. Bush said the action heralded a "sustained, comprehensive and relentless" campaign against terrorism. Eyewitnesses said they saw flashes and heard explosions over the Afghan capital of Kabul in the first phase of what the United States has said will be a protracted and wide-ranging war against terrorism and the states that support it. The attack had been prepared since the September 11 suicide attacks on the United States that killed around 5,600 people. A U.S. Air force B-52 bomber drops a load of M117 750-pound bombs over a bombing range in the United States in this undated file photo.B-52s, B-1 and B-2 stealth bombers are some of the aircraft that were reportedly used in the attacks on Afghanistan. REUTERS/USAF-Handout KM/HB
Two Northern Alliance soldiers watch as the dust and smoke rises after
explosions in Taliban positions on Kalakata hill, near the village of
Ai-Khanum in northern Afghanistan, November 1, 2001. The Pentagon said
on Wednesday B-52s dropped heavy loads of bombs, a tactic known as
carpet bombing, on Taliban troops north of Kabul as a result of
improved tergeting intelligence, partly from U.S. special forces on the
ground. REUTERS/Vasily Fedosenko
U.S. Marine PV2 Eileen M. Schnetzko stands on guard at Bagram airport,
March 2, 2002. U.S. troops are based at Bagram, north of Kabul. There
are some 4,000 U.S. troops based in Afghanistan as part of the
international war against terrorism. REUTERS/Mario Laporta REUTERS
A U.S. special forces soldier (L) watches while Afghan militia wait in
line to turn in their weapons at a military base in Kunduz, Afghanistan
October 22, 2003. A long-awaited U.N.-sponsored project to disarm,
demobilise and reintegrate 100,000 soldiers across Afghanistan was
under way in the north, a key step to bringing eventual peace to this
war-torn country. The "New Beginnings Programme," which lets soldiers
exchange their weapons for jobs, began in the northern province of
Kunduz this week. REUTERS/Richard Vogel/Pool
A Chinook helicopter hovers over U.S. troops in the village of Jegdelic, about 90 km (56 miles) southwest of Kabul, Afghanistan, in this picture taken on December 24, 2004. A U.S. military helicopter carrying up to 20 American troops crashed during an anti-guerrilla mission in eastern Afghanistan on Tuesday, U.S. officials said. The fate of those on board was not immediately known. Picture taken December 24, 2004. REUTERS/Ahmad Masood Am/mk BEST QUALITY AVAILABLE
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British and a U.S. soldiers control the crowd during medical assistance in Kabul February 26, 2008. U.S. and British troops provided medical assistance worth of $50,000 to the Afghan locals in Kabul on Tuesday. REUTERS/Ahmad Masood (AFGHANISTAN)
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U.S. Secretary of Defense Robert Gates (L) and U.S. Army General David McKiernan, the top U.S. and NATO Commander in Afghanistan (R) listen to Afghan governors and local officials during their visit to Forward Operating Base Airborne in the mountains of Wardak Province, Afghanistan, May 8, 2009. Gates on May 11, 2009 replaced the top U.S. and NATO commander in Afghanistan, U.S. Army General David McKiernan, less than a year after he took over the war effort there. Gates said he asked for McKiernan's resignation and recommended Army Lieutenant General Stanley McChrystal, a former commander of special operations forces, to take over command of 45,000 U.S. troops and about 32,000 other troops from non-U.S. NATO countries. REUTERS/Jason Reed (AFGHANISTAN MILITARY POLITICS)
U.S. soldiers of the 2-12 Infantry, 4th Brigade prepare to tow a broken-down improvised explosive device (IED) detecting Huskie vehicle during a patrol in the Pesh Valley in Afghanistan's Kunar Province July 30, 2009. REUTERS/Tim Wimborne (AFGHANISTAN CONFLICT)
U.S. soldiers kneel during a memorial ceremony for Captain Daniel Whitten and Private First Class Zachary Lovejoy from Charlie Company, 4th Brigade combat team,1-508, 82nd Parachute Infantry Regiment at the Remote Sweeney FOB in Zabul province, southern Afghanistan, February 8, 2010. CPT Whitten from Grimes, Iowa, and PFC Lovejoy from Albuquerque, New Mexico, were killed by an IED on February 2. when on patrol in southern Afghanistan.
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Canadian soldiers play table football under flashlights at a military outpost near the village of Bazaar e Panjwaii, in the Panjwaii district of Kandahar province August 8, 2010. REUTERS/Bob Strong (AFGHANISTAN - Tags: CONFLICT MILITARY)
U.S. Army medic Staff Sergeant Rahkeem Francis with Charlie Company, 6-101 Combat Aviation Brigade, 101st Airborne Division, treats an Afghan boy with a broken leg onboard a medevac helicopter near the town of Marjah in Helmand Province, August 19, 2010. REUTERS/Bob Strong (AFGHANISTAN - Tags: CONFLICT MILITARY POLITICS)
U.S. Army soldiers from the 2nd Platoon, B battery 2-8 field artillery, fire a howitzer artillery piece at Seprwan Ghar forward fire base in Panjwai district, Kandahar province southern Afghanistan, June 12, 2011. REUTERS/Baz Ratner (AFGHANISTAN - Tags: CONFLICT MILITARY IMAGES OF THE DAY POLITICS)
An Afghan shepherd walks with a flock of sheep past a U.S. Marines armored vehicle of the Weapons Company, 1st Battalion, 3rd Marines outside the Camp Gorgak in Helmand province, southern Afghanistan July 5, 2011. REUTERS/Shamil Zhumatov (AFGHANISTAN - Tags: POLITICS MILITARY ANIMALS IMAGES OF THE DAY)
First Sergeant Mac Miller from Comanche Troop 3rd Squadron 4th Cavalry lift weights as he exercises in Forward Operating Base Connolly in Nangarhar province, eastern Afghanistan, March 3, 2012. Picture taken March 3, 2012. REUTERS/Erik De Castro (AFGHANISTAN - Tags: MILITARY CONFLICT)
A U.S. Army soldier and a member of the Afghan Uniform Police arm wrestle prior to a joint patrol near Command Outpost AJK (short for Azim-Jan-Kariz, a near-by village) in Maiwand District, Kandahar Province, Afghanistan, January 28, 2013. REUTERS/Andrew Burton (AFGHANISTAN - Tags: POLITICS CIVIL UNREST MILITARY SOCIETY TPX IMAGES OF THE DAY)
A U.S. service member takes a "selfie" as U.S. President Barack Obama shakes hands with troops after delivering remarks at Bagram Air Base in Kabul, May 25, 2014. Obama, on a visit to Afghanistan, said on Sunday his administration would likely announce soon how many troops the United States will keep in the country, as it winds down its presence after nearly 13 years of war. REUTERS/Jonathan Ernst (AFGHANISTAN - Tags: POLITICS MILITARY)
Afghan children gesture at U.S. soldiers from Grim Company of the 3rd Cavalry Regiment as they stand guard near an Afghan police checkpoint during a mission near Forward Operating Base Fenty in the Nangarhar province of Afghanistan December 19, 2014. REUTERS/Lucas Jackson (AFGHANISTAN - Tags: CIVIL UNREST POLITICS MILITARY CONFLICT)
U.S. soldiers attend to a wounded soldier at the site of a blast in Kabul, Afghanistan June 30, 2015. At least 17 people were wounded in a suicide bomb attack on NATO troops as their truck convoy passed down the main road running between Kabul's airport and the U.S. embassy, police and health ministry officials said. REUTERS/Omar Sobhani TPX IMAGES OF THE DAY
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"The service members came under fire during a train, advise and assist mission with our Afghan partners to clear a Taliban position and disrupt the group's operations in Kunduz district," the U.S. military said in a statement.
In a separate statement, the NATO-led Resolute Support mission confirmed that air strikes had been carried out in Kunduz to defend "friendly forces under fire".
"All civilian casualty claims will be investigated," it said.
In a statement, the Taliban said American forces were involved in a raid to capture three militant fighters when they came under heavy fire. An air strike hit the village where the fighting was taking place, killing many civilians.
The deaths underline the precarious security situation around Kunduz, which Taliban fighters came close to over-running last month, a year after they briefly captured the city in their biggest success in the 15-year long war.
While the city itself was secured, the insurgents control large areas of the surrounding province.
The U.S. military gave no details on the identity of the two personnel who were killed or what units they served with and there was no immediate detailed comment on the circumstances of their deaths.
Although U.S. combat operations against the Taliban largely ended in 2014, special forces units have been repeatedly engaged in fighting while providing assistance to Afghan troops.
Masoom Hashemi, deputy police chief in Kunduz province, said police were investigating to try to determine if any of the dead were linked to the Taliban.
Thousands of U.S. soldiers remain in Afghanistan as part of the NATO-led Resolute Support training and assistance mission and a separate counterterrorism mission.
The deaths come a month after another U.S. service member was killed on an operation against Islamic State fighters in the eastern province of Nangarhar.
Afghan forces, fighting largely on their own since the end of the international combat mission, have suffered thousands of casualties, with more than 5,500 killed in the first eight months of 2016.
(Additional reporting by Hamid Shalizi; Writing by James Mackenzie; Editing by Simon Cameron-Moore, Robert Birsel)