A U.S. service member was killed in Afghanistan on Monday, defense officials have announced.

No information was immediately available about where the service member was killed. The Defense Department is withholding the service member's name pending next of kin notification.

A total of 20 U.S. troops have been killed supporting operations in Afghanistan so far in 2019.

Seventeen of those troops were killed in combat. The other three died in non-combat incidents.

At least two U.S. military veterans who were working as defense contractors have also died in Afghanistan.