WASHINGTON - Authorities were investigating a Washington police officer on Thursday over a possibly threatening remark he allegedly made about first lady Michelle Obama, reports said.

The unidentified officer assigned to a motorcade detail was speaking with colleagues on Wednesday about potential threats against the Obamas and allegedly made a comment about shooting Mrs. Obama, The Washington Post reported, citing police sources.

The comment was apparently overheard by another officer, who told a superior. Metropolitan police notified the Secret Service, which oversees security for the president and his family.

Without confirming details, police said in a statement that the department had received "an allegation that inappropriate comments were made."

It was unclear if the remark constituted an actual threat against the first family.