Updated

HOUSTON -- One person was killed and five others were injured Wednesday in a shooting at a football field at a Houston high school that witnesses and police said appeared to be gang-related.

Witnesses say the shooting happened about 6:45 p.m. Wednesday as a group of young men watched their girlfriends play football at the Worthing High School field in southern Houston. The game was not a school-sanctioned activity and the shooting did not happen while school was in session.

Homicide Lt. John Zitzmann said witnesses told police that a Ford Taurus full of young men drove onto the field and a brief fistfight broke out. The fight appeared to be over when the shooting started, Zitzmann said.

Police said witnesses told them someone in the crowd of spectators may have fired back at the gunmen. Police have not released the names of those who were shot.

Tordre McMillan told KTRK-TV of Houston that he was playing baseball nearby when gunfire erupted. "Too many people, and I couldn't tell who had a gun. I was running for my life," he said.

Officers later found a blood-stained Ford Taurus at an apartment complex five miles away, police said.

Zitzmann said he couldn't confirm if the shooting victims were themselves part of a gang, but he said that appears to be part of the shooters' motive.

"They either came down here to start trouble or settle an old score," he told the Houston Chronicle.