Thankfully it was a replica: “While speaking with an officer, the male attempted to remove a firearm from his pants” at a Police Station

From MPD:

“Detectives from the Metropolitan Police Department’s Fifth District have announced the arrest of an armed male subject who entered the Fifth District Police Station on Bladensburg Road, Northeast at approximately 10:30 pm on Thursday, January 8, 2015. While speaking with an officer, the male attempted to remove a firearm from his pants. The officer and another officer who was nearby, immediately observed this and were able to quickly disarm the man and place him under arrest without incident. The man was found to be in possession of a black replica pistol.

Further investigation revealed that just prior to entering the Fifth District police station, the subject had committed an armed carjacking in the 200 block of Webster Street, NE.

The adult male arrested was 18-year-old D’Angelo Hamilton, of Northeast DC. He has been charged with carjacking, assault on a police officer, and carrying a dangerous weapon. The motive for the incident at the police station is unclear and remains under investigation at this time.”