The Latest on a fatal shooting at a Texas transportation company (all times local):

11:10 a.m.

Officials say several schools went on lockdown amid reports of gunfire at a transportation company near Houston.

Harris County sheriff's officials say a recently fired employee opened fire Wednesday at a Knight Transportation office in Katy, about 20 miles west of Houston. Sheriff Ron Hickman said one worker was killed and another injured before the gunman fatally shot himself.

Katy Independent School District spokeswoman Denisse Cantu says a high school across the street from the facility went on lockdown for about an hour as a precaution. She said three other district campuses also were briefly closed amid the reports.

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10:15 a.m.

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 had been 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. A nearby high 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.

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10 am.

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.