Two people were stabbed and viciously beaten in the Chapparal Night Club parking lot on Monday.
Brownsville police said "looking at someone the wrong way" turned into a brawl between rival gangs in the club.
Four men approached two brothers when the fight broke out, according to Brownsville police.
"The four suspects jumped in front of the car and the passenger one of the brothers was stabbed while he was sitting in the car," Officer Billy Killebrew said. "They pulled the other guy out of the car and began to beat him up and stab him several times." One of the victims was stabbed several times in his leg and in the lower part of the body.
The victims were both transported to a nearby hospital with non-life threatening injuries.
Reynaldo Quiroz (24), Ruben Alfaro (20), Michael Flores (18) and Rene Rodriguez (19) were all taken into custody.