Metro Transit Police are asking for help from anyone who witnessed an assault that occurred inside the L’Enfant Plaza station about 7:15 p.m. Sunday.

A man received minor injuries and declined medical help, according to Metro, but a video of it has raised outrage that no observers intervened.

Metro asks customers who witness fights to report them immediately through emergency buttons on trains or station pylons or to find an employee.

Anyone with information about Sunday’s assault is asked to call Metro Transit Police detectives at 202-962-1792. Cops will be stepping up patrols at the station, Metro said.