BAYTOWN, Texas (AP) — A deputy constable has died after he was shot moments after arriving for work at a Houston-area courthouse.

Authorities at a brief news conference did not indicate a motive for the shooting Monday morning of Harris County Precinct 3 Assistant Chief Deputy Clinton Greenwood. A manhunt is underway for the gunman.

Greenwood was airlifted to a Houston hospital where he died. He was a 30-year law enforcement veteran.

The shooting occurred in Baytown, east of Houston. It led to the lockdown of a nearby high school and a broad response by law enforcement as authorities closed intersections as part of their search for the suspect.

Access to businesses in the area was limited as authorities conducted their search.