This could be a very real and very dark turning point for United States’ involvement in Afghanistan, something that’s been going on for more than 14 years.

Because the Washington Post is reporting on Saturday that U.S. forces “might have mistakenly bombed a hospital” in the northern part of the troubled country, killing at least 19 people including three children.

More from the Post:

In a statement, Doctors Without Borders said an airstrike “partially destroyed” its trauma hospital in Kunduz, where the Afghan military has been trying to drive Taliban fighters from the city.

The airstrike killed at least 12 Doctors Without Borders staff members, the group said. Three children were also reportedly killed. At least 37 other people were seriously injured, including 19 staff members and 18 patients and caretakers. Officials warned the death toll could rise as dozens of people remain unaccounted for.

“This attack is abhorrent and a grave violation of International Humanitarian Law,” Meinie Nicolai, the group’s president, said in a statement.

The United Nations’ top human rights official, Zeid Ra’ad al-Hussein, equated the errant airstrike to more than an unfortunate product of war, but rather, called it a crime.

“This deeply shocking event should be promptly, thoroughly and independently investigated and the results should be made public,” he said. “The seriousness of the incident is underlined by the fact that, if established as deliberate in a court of law, an airstrike on a hospital may amount to a war crime.”

U.S. Secretary of Defense, Ash Carter, didn’t have much to say on the incident other than reassuring the public that they’re launching a full investigation and sending thoughts and prayers “to everyone affected”.

Doctors Without Borders is a nonprofit organization that was founded in 1971 by French doctors and journalists. Since then they’ve given emergency medical attention and treatment to those affected by the worst the world has to offer (war, natural disasters, famine, etc.) where there’s no doctors or medical professionals available to aid them.

The organization was awarded the Nobel Peace Prize in 1999.