One man was killed and two other men were wounded in a shooting inside a lounge in Philadelphia's Frankford neighborhood Monday night, according to police.

The shooting happened around 10 p.m. inside the El Lounge and Venue at Frankford Avenue and Overington Street. The venue is underneath the tracks for the Market-Frankford Line and close to the Arrott Transportation Center.

Police said more than 40 shots were fired during the shooting.

Investigators say there were no events happening inside the venue when shots rang out. Officers arrived at the scene and found a 30-year-old man and a 34-year-old man, both of whom had been shot in their legs. Both were taken to nearby hospitals and listed in critical condition.

"We believe the 30 and 34-year-old, after being shot in the ballroom, were able to run outside — because we followed trails of blood and that's where we found both of those victims ... they were conscious," Philadelphia Police Chief Inspector Scott Small said.

Inside the lounge, officers found a third man dead from multiple gunshot wounds. Detectives found a gun underneath the man.

Small said police found a mix of handgun and rifle rounds scattered around the business.

Police are still working to determine a motive for the shooting and a description of the shooter or shooters, Small said. There were several security cameras inside the building which may have some answers.