Parts of northwestern Harris, southwestern Montgomery and northeastern Waller counties were briefly under a tornado warning Tuesday afternoon, the National Weather Service said, as the prospect of severe storms on Christmas Eve loomed.

The National Weather Service issued a severe thunderstorm warning for northwest Harris County until 4 p.m. NWS also issued a tornado warning for Montgomery County, Waller County, and Harris County. The warning expired at 3:15 p.m.

A shooting at Katy Mills Mall ended Monday evening with at least one person injured, according to Harris County Sheriff Ed Gonzalez. The incident was initially reported as an active shooter, but a preliminary investigation determined one person had shot another before they both fled the scene,

Police say nobody was injured when a gunman opened fire inside Katy Mills Mall on Monday night. It was full of holiday shoppers who were evacuated. Police are still looking for the gunman and a person who was with him.