The Baltimore Sun reports the men allegedly demanded cash from the register at a Woodlawn bar Tuesday evening while a group of officers gathered for a longtime sergeant's retirement.
"I'm sure that they weren't planning on there being a large room filled with police officers", Baltimore County officer Jennifer Peach told WBAL.
The assailants, Joseph McInnis III, 21, and Tyree McCoy, 22, entered the take-away section of the establishment and held the employee at gunpoint. The two men have been charged with armed robbery and possession of a handgun, and are now being held without bail.
In a similar incident, three men were arrested and charged for robbing a pub in Nottingham, England. Booking photos show McCoy's left eye appears red and swollen shut, and he has a small white bandage over his eyebrow.
McInnis had a visible cut and some apparent abrasions to his face. They reportedly pulled out guns and demanded the cashier give them money. An employee informed the officers that the robbery had just occurred and a few of the officers attending the outing went outside and were able to chase down and arrest the suspects nearby.
Only one officer had a gun during the incident, the report said.
"These officers were pursuing suspects involved in an armed robbery".
"They appeared at Nottingham Magistrates' Court this morning (Wednesday 30 August), and were remanded in custody to appear at Nottingham Crown Court on 27 September 2017", a police spokesman said, Nottingham Post reported.
Police officials said the use-of-force investigation is administrative in nature.
The Sun reported that the robbery was caught on surveillance footage from the pub.