The Metropolitan Police Department's internal affairs division is investigating a report that a D.C. police officer working as a motorcade escort threatened first lady Michelle Obama, the Washington Post reports.

An officer, who hasn't been named, allegedly said he would shoot President Obama's wife, and displayed a photo of the gun he would use on his phone on Wednesday morning, according to the report. A Secret Service spokesman said the agency was aware of the situation and would follow up.

“We received an allegation that inappropriate comments were made,” D.C. police spokeswoman Gwendolyn Crump told the Washington Post in an e-mail. "We are currently investigating the nature of those comments."