Officers are responding to reports of gunfire at a transportation company near Houston.

The Harris County Sheriff's Office says deputies responded Wednesday following reports of a shooting at a Knight Transportation office in Katy, about 20 miles west of Houston. The office didn't immediately return phone messages for details.

Numerous patrol vehicles are surrounding the facility. A nearby high school is on lockdown as a precaution.

A message left with Phoenix-based Knight Transportation also wasn't immediately returned. The company provides truckload transportation services.