A man who made “comments that caused concern” was removed from an airline leaving San Diego International Airport and headed for San Francisco Tuesday.
The passenger on United Flight 662 made the comments while the flight was still at the gate.
Harbor Police were called and removed the man, according to Lindbergh Field spokesperson Jonathan Heller.
Heller did not have specifics on the comments made that prompted the incident.
The flight departed at 7:36 a.m. It arrived in San Francisco at 8:53 a.m.
Travelers and airports around the world were on heightened alert following deadly explosions at the Belgium airport and metro station.
The Islamic State group claimed responsibility for the attacks that left at least 31 people dead today in Brussels, saying its extremists opened fire in the airport and "several of them" detonated suicide belts.
