HOUSTON -

Authorities are responding to a fatal shooting at an after hours club in southwest Houston.

It happened Sunday morning at Club H20 at 9427 Country Creek Drive and Bissonnet Street.

One person is dead and another was shot in the leg. The shooter is on the loose.

Authorities say there was a private party at the club when three regular patrons were let in. Shortly after, the patrons were told by security guards that the club was closing and that no one was allowed back in.

That's when investigators say the group of regulars became angry and started arguing. The argument escalated and a person was fatally shot and another was injured and taken to the hospital.

Officials say the shooter left in a maroon Ford Expedition and is still on the loose.

Police say they immediately detained witnesses including security guards when they made it to the scene.