A gunman stepped out of a silver sedan and started shooting people at a Dallas-area outlet mall on Saturday, killing eight and wounding seven others — three critically — before being killed by a police officer who happened to be nearby, authorities said.

Authorities did not immediately provide details about the victims at Allen Premium Outlets, a sprawling outdoor shopping center, but witnesses reported seeing children among them. Some said they also saw what appeared to be a police officer and a mall guard unconscious on the ground.