A Northwest Side bar manager was stabbed and two others were beaten when a group of customers refused to leave at closing time early today, KSAT-TV is reporting.

The three managers approached the group on the patio of Deol in the 6800 block of North Loop 1604 when the violence erupted, the station says. The stabbing victim was hospitalized with wounds to his torso and right arm.

The three customers involved in the assault fled, but witnesses described their car, KSAT reports. Officers tracked the car to the Forest Glen Apartments in the 11600 block of Huebner Road.

Police have not announced any arrests, the station adds.

Managers attacked after asking customers to leave