On Tuesday afternoon, the Pentagon released some tragic news.

They say a United States military member, while on patrol with Afghan forces in a province near the Pakistani border, was killed by a roadside bomb.

More via the Associated Press:

U.S. forces have been conducting counterterror operations with Afghan troops against Islamic State militants in Achin, Nangarhar province. The U.S. military says the commando, whose name was not released, died from wounds sustained when the patrol triggered an improvised explosive device.

Gen. John Nicholson, commander of U.S. forces in Afghanistan, says the U.S. remains committed to defeating the Islamic State Khorasan group, the IS affiliate in Afghanistan.

The U.S. has been conducting airstrikes near Achin. Last week Afghan officials said a U.S. airstrike hit a house, killing civilians. The U.S. says it’s looking into the incident.

Stay tuned to to the blog for more on this developing story.