The shooting happened in the 200 block of Uvalde Road.
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The celebration was for someone buried a few hours before the shooting occurred.
Approximately 50 people were gathered in the parking lot of The Selena apartment complex on Uvalde when gunfire erupted.
There were "different types" of shell casings on the ground, leading investigators to believe there were multiple weapons and shooters, according to the sheriff's office.
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Officials did tell ABC13 that witnesses at the scene said that alcohol was present and some individuals were playing a dice game.
"It's bad," said Doris Brown, who lives at the complex. She pleaded, "Just try to get along."
It is still unclear what exactly led to the shooting, but according to police, all injured victims, including two teenagers, are expected to be OK.
Anyone with information regarding the shooting is urged to contact the Harris County Sheriff's Office.
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