A Potomac, Maryland, man was fatally shot by police Thursday morning while a search warrant was being served, police in Montgomery County said.

Duncan Socrates Lemp, 21, was being served what police describe as a “high-risk search warrant related to firearms offenses” on St. James Road in Potomac.

During service of the warrant, police shot and killed Lemp.

The incident is under investigation. The officer involved is on administrative leave as part of the department’s standard operating procedures.