The Allen Fire Department transported nine victims, but others may have been transported by other agencies or driven to a hospital by friends or family.
Police said there are three victims in critical condition and four in stable condition.
A spokesperson for Medical City Healthcare said eight victims ranging from 5 to 61 years old are being treated at their facilities.
There were multiple agencies that responded to secure the scene, including the Allen Police Department, Collin County Sheriff's Office, FBI, and ATF.
Police said there is no active threat at this time, and they believe the shooter acted alone.
"Got boxes to shut the door because we didn’t know where the shooter was, mayhem and panic," Abu Akther.
Our thoughts and prayers are with the victims, their families and others affected by this heinous act. »