Four teenagers suspected of sexually assaulting a woman in a Brooklyn park remained in police custody Monday while investigators gathered evidence to file criminal charges, a law enforcement official said late Monday.

The exact nature of the charges is still to be undetermined, NYPD spokesman Stephen Davis said.

A rape kit analysis won’t be ready for a few days but Davis hinted that at a minimum, the four could face assault charges because the 18-year-old victim had physical injuries.

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The suspects, a 14-year-old, two 15-year-olds and a 17-year-old, have been interviewed by detectives, investigators said and Brooklyn prosecutors Monday were still considering what charges to file against the four.

A fifth teenager suspected in the attack remained on the loose Monday.

Detectives interviewed the 14 and 15 year olds with their parents present, as required by law, Davis said. He wouldn’t disclose what the suspects told police or comment on reports the girl and the five teens were involved in consensual sex.

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According to police, the 18 year-old victim was with her father inside the park near the intersection of Lott Avenue and Osborne Street in the Brownsville section of Brooklyn after buying bottles of beer at a nearby deli when they were approached by the five teens, one of whom was armed with a handgun. The suspect with the gun pointed it at the father and daughter, ordering the man to leave, police said.

The father went to the deli and someone there reportedly rebuffed his request to call 911 about the attack.

About 15 minutes after he fled the park, the father met two uniformed NYPD officers and returned to the park with the cops. Davis said there was no 911 call about the incident. The four were taken into custody Sunday night.

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Davis also said investigators are still looking for the handgun.

He said detectives obtained a surveillance tape Saturday showing the five suspects entering a different deli. The NYPD released the tape to the news media at about 8 p.m. that evening. Another video obtained by police showed what appeared to be the father entering the park with his daughter close to the time of the suspected attack.