A man claiming to be an energy salesman attempted to rob a Dyker Heights apartment Thursday, according to police.

The incident happened around 6 p.m. on 66th Street and 11th Avenue. The man who lives in the apartment says the suspect somehow gained entrance to the apartment building, knocked on his door, showed a badge and said he was selling an energy package.

When the resident declined the offer the suspect became aggressive, according to police.

The victim says the suspect tried to force his way in the door and showed a gun. The suspect fled when the victim was able to keep him out of the apartment.

The victim says he spoke to his landlord about adding additional security measures to help make sure this does not happen to other residents.