Fort Lauderdale Police have released a sketch of a man they want to contact, after a teenager was allegedly knocked unconscious and sexually assaulted on Tuesday night at a city park.

According to Police Sgt. DeAnna Greenlaw, the 15-year-old boy was playing basketball at Bass Park, located at 2750 NW 19th St., when he had a conversation with the man.

Greenlaw explains the teen was later struck in the head by someone, and was knocked unconscious in the process.

She goes on to say that the victim regained consciousness a few hours later, when he realized that he had been sexually assaulted.

Detectives do not consider the man shown in the sketch to be a suspect, but are trying to speak with him to determine whether he has any information about the attack.

Additionally, Greenlaw says detectives are distributing fliers in the area around the park, with the goal of finding out more information that could lead to the arrest of the person responsible.

Anyone with information is asked to call Broward Crime Stoppers at (954) 493-8477.

A reward of up to $3,000 is offered for anonymous tips that lead to an arrest.