Ramped-up security may delay air travel after Brussels attacks

HOUSTON (KTRK) -- The U.S. Department of Homeland Security says there is no specific threat against the United States after Tuesday's deadly terror attacks in Brussels.

However, Secretary Jeh Johnson cautioned travelers to remain vigilant. Back here in Houston, security has increased at Houston's airports and at MetroRail stations.

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We have seen long lines and slight delays at Bush Intercontinental Airport and Hobby Airport this morning.

Travelers should arrive at the airport at least two hours before their departure, and give themselves plenty of time to get through security checkpoints.