HOUSTON — Shots were fired near a ticket counter at Houston’s largest airport today, and at least one person was critically injured, a Houston police spokesman said.

A call that there had been a “discharge of firearms” came into police at 1:35 p.m., John Cannon, the spokesman said. The shots were fired near the ticket counter in Terminal B at Bush Intercontinental Airport, he said. One person has been taken to an area hospital with life threatening injuries.

Dale Howard, of Tomball, was at the baggage handling area of the airport waiting for his sister to arrive on an incoming flight when he heard two shots fired from the floor above. A few seconds later, he said he heard three more shots.

“People were screaming. I knew exactly what it was — gunfire,” Howard said.

Police from an adjacent station rushed in, and Howard said he directed them to the floor above.

Parts of the terminal were blocked off as police investigate.