D.C. officer investigated after comments about Michelle Obama alleged A D.C. police officer who worked as a motorcycle escort for White House officials and other dignitaries was moved to administrative duty Wednesday after he allegedly was overheard making threatening comments toward Michelle Obama, according to several police officials. The police department's Internal Affairs Division is investigating the alleged comments and notified the U.S. Secret Service Wednesday, said the officials, who spoke on condition of anonymity because they were not authorized to give details of the investigation. (Scott Olson/GETTY IMAGES) - Michelle Obama speaks at a May campaign rally in Ohio. Sean D. Branch, 24, was arrested in a case in which a concrete slab was dropped on the head of a dog sleeping behind a convenience store in Northeast Washington last month. Allison Klein Dunning died early Thursday morning in Hilton Head, according to Alexandria police. Maggie Fazeli Fard This is the third arrest in a spate of unrelated killings in the District last weekend. The motorman allegedly made the comments Wednesday morning as several officers from the Special Operations Division discussed threats against President Obama. It was not immediately clear where the alleged conversation took place or exactly how many officers took part in the conversation. During that conversation, the officials said, the officer allegedly said he would shoot the First Lady and then used his phone to retrieve a picture of the firearm he said he would use. It was not immediately clear what type of firearm was allegely shown. An officer overheard the alleged threat and reported it to a police lieutenant at the Division, who immediately notified superiors, the officials said. We received an allegation that inappropriate comments were made. We are currently investigating the nature of those comments," D.C. police spokeswoman Gwendolyn Crump said in an e-mail. She declined to discuss the matter further. Police officials declined to identify the officer. Officials from the U.S. Attorney's office declined comment. There was no indication of a legitimate danger to Michelle Obama. A Secret Service spokesman declined to provide further details, saying in an e-mail that the agency was aware of the incident and "will conduct appropriate follow-up." Police officials immediately reassigned the officer to other duties, the police officials said. The police escorts the Special Operations Division performs for the First Family are dignitary escorts. Police escorts for non-dignitaries drew attention in April 2011 when District officers accompanied actor Charlie Sheen from Dulles Airport to DAR Constitution Hall when Sheen was running late to a concert. The propriety and cost of that run - which was reimbursed by a concert organizer - was debated later at a District Council hearing and reviewed by the District's Office of the Inspector General which concluded, among other findings, that the department needed clearer guidelines on conducting escorts.