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BRUSSELS, BELGIUM –  European Commission representatives held a moment of silence for the victims of the Brussels terror attacks, knowing they and their countries could be next on the ISIS hit list.

President Obama used his joint appearance with Argentina’s president to express their mutual sympathies. “Today, the people of the United States and Argentina stand with the Belgian people and express our extraordinary sorrow for the losses they’ve experienced.”

In Brussels, police are still searching for accomplices in the attacks at the airport and subway station that killed 31 and wounded about 300.

Police say two brothers were among the team of bombers. They say Khalid el-Bakraoui set off the bomb in a subway car at Maelbeek metro. Ibrahim exploded one of the bombs at the airport.

Belgium police also identified what’s left of Najim Laachraoui, who they blew himself up at the airport.

They also say he’s a key bomb maker and may have been involved in the Paris attacks.

The State Department issued a travel alert for Americans heading to Europe.

It doesn’t say to stay away, it just says to avoid crowded places. Like maybe airports?

Don Roose was at Bush Intercontinental Airport. He and his wife are planning a trip to Europe in a couple of months.

“You know, I think one of the reasons you still consider to travel is just because you think the probability is just so low that you’re going to be involved in a terrorist attack. Of course, I think that’s the way most people feel.”

People around the world continue holding vigils, and monuments are illuminated in the colors of Belgium’s flag to honor to the victims of this latest attack on innocent people.