Police are asking for your help tracking down a group of people they said robbed a man in Brooklyn.

It happened in the vicinity of Avenue S and East 2nd Street in Gravesend on Dec. 20.

Four people are seen in the video, seen above, approaching a man.

Police said they then displayed a firearm at the 41-year-old.

One person is seen in the video ramming his knee into the victim's side while the others grabbed the victim. Police said they stole the victim's wallet, which contained a credit and debit card.

The perpetrators are described to being in their mid- to late-teens, officials said.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-8477, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com