In this Jan. 15, 2018 file photo, U.S. Marines stand guard during the change of command ceremony at Task Force Southwest military field in Shorab military camp of Helmand province, Afghanistan. Credit: Massoud Hossaini | AP

KABUL, Afghanistan – Two U.S. troops were killed in Afghanistan on Friday while carrying out an operation, the U.S.-led NATO coalition said.

No details were provided, and their names will not be disclosed until 24 hours after their next of kin are notified, according to Department of Defense policy. But their deaths come as the United States plans to withdraw its 14,000-troop advisory mission in Afghanistan.

President Donald Trump recently tied the withdrawal to progress toward a peaceful settlement aimed at ending the 18-year war.

Despite the talks, Afghanistan is suffering from crippling violence, with a record number of civilian casualties last year. On Thursday, a string of bombs exploded in Kabul as Afghans celebrated the Persian New Year, Nowruz, killing six and wounding 23 more. The Islamic State claimed responsibility Friday for the bombings near a Shiite shrine and cemetery, saying the aim of the attack “was to spoil the ritual of the polytheists.”

Peace talks between the United States and the Taliban have intensified in recent months, negotiations that have rankled the Afghan government in Kabul, which has been excluded from the process.

Parallel talks have also been held in Moscow, and in an effort to expand internationally, the U.S. chief negotiator, Afghan-born Zalmay Khalilzad, is hosting his Russian, Chinese and European Union counterparts in Washington on Thursday and Friday.

Last week, relations between Washington and Kabul hit a new low when Afghanistan’s national security adviser, Hamidullah Mohib, charged that any U.S. deal with the Taliban would “sell out” his country and “dishonor” American troops who fought and died in the conflict. He added that Khalilzad was acting out of personal ambition.

In response, Mohib was barred from any future dealings with U.S. officials, Afghan and U.S. media reported.