U.S. cities ramp up security in wake of Brussels attacks

At least two U.S. cities -- Washington and New York City -- have stepped up security in the wake of the explosions in BrusselsTuesday, officials said.

At least 26 people were killed Tuesday when three explosions that ripped through the Belgian capital of Brussels, according to Belgian media, and raised the reality of terror once again in the heart of Europe.

One blast reportedly occurred at a subway station, and two more in the Brussels airport departure hall.

President Barack Obama, currently in Cuba on a foreign trip, has been informed of the events, which a Belgian Prosecutor Frederic Van Leeuw called terrorist attacks.