LAX and Union Station on heightened alert

Los Angeles County sheriff’s transit police stand by the entrance to the Metro Red and Purple lines Tuesday morning as an added measure of security following terrorist attacks in Brussels.

(Irfan Khan / Los Angeles Times)

March 22, 2016 10:10 AM PT

LAX and Union Station on heightened alert

Los Angeles County sheriff’s transit police patrol Union Station in downtown Los Angeles Tuesday morning.

(Irfan Khan / Los Angeles Times)

A canine unit patrols Union Station in downtown Los Angeles Tuesday morning.

(Irfan Khan / Los Angeles Times)

LAX airport police officers with automatic weapons patrol near the Tom Bradley International Terminal in Los Angeles. (Irfan Khan / Los Angeles Times)

LAX airport police officer Cortinas keeps watch at Terminal Two in Los Angeles following a terrorist attack in Brussels that has put law enforcement on high alert.

(Irfan Khan / Los Angeles Times)