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Katy, Texas • Authorities say a recently fired employee opened fire at a transportation company near Houston, killing one employee and injuring another before fatally shooting himself.

Harris County Sheriff Ron Hickman said during a news conference Wednesday that the gunman was fired earlier in the day, then returned with a gun to the Knight Transportation office in Katy, about 20 miles west of Houston.

Hickman says the man opened fire, killing one person and injuring another. Hickman says the man then shot himself.

The sheriff didn't release the name of the gunman or the victims.

Numerous patrol vehicles are surrounding the facility. At least one nearby school went on lockdown as a precaution.

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