U.S. 'reassessing' in face of Brussels attacks

The airport in Brussels was in shambles from a terror attack.

The United States declared Tuesday it was reassessing its security status in the face of the Brussels terror attacks, while world leaders sent out strong messages of condemnation, calling the strikes "barbaric" and warning citizens to stay on high alert.

Fox News reported Homeland Security Secretary Jeh Johnson said the United States hasn't received "specific or credible" threats that have targeted the nation, but that intelligence and security officials are "reassessing" the situation.

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"They're doing a reassessment, re-calibration," Fox reported, citing Johnson.

Meanwhile, New York police have bolstered security at key city spots.

"BREAKING," tweeted one official, BBC found. "NYPD to ramp up security at mass transit points, bridges & tunnels, and other landmarks following today's attacks in Brussels."

And Brussels is in a state of chaos, sending out official statements that tell citizens to "stay where you are" and keep on high alert.

News 24 reported Belgium Prime Minister Charles Michel has deployed military forces to Brussels to deal with what he called "this black moment in our country's history."

World leaders have issued strong statements of condemnation against the terrorists who struck at the heart of Brussels on Tuesday, killing at least 13 and injuring 35 or more during a series of blasts that hit at the airport and subway system.

Russia President Vladimir Putin called the terror strikes "barbaric acts" through his press secretary Dmitry Peskov.

"The president resolutely condemned these barbaric acts, expressed his condolences to the Belgian people and assured King Philippe of absolute solidarity with the Belgians in these difficult hours," Peskov said, BBC reported.

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And Russian Foreign Ministry spokesperson Maria Zakharova said, BBC reported: "As more and more time and lives are lost, people are beginning to understand that this policy of double standards in evaluating terrorist activities is a dead-end policy."

British Prime Minister David Cameron said he was "shocked and concerned" by the attacks, and vowed the United Kingdom "will do everything we can to help" in Belgium, Sky News reported.

France Interior Minister Bernard Cazeneuve said an additional 1,600 police will be tasked to guard transportation facilities at key spots in the country, including aiports and the borders. London is doing similarly, BBC reported.

A couple hours after the attack, and the White House was largely mum on the attacks. The latest Twitter post from the White House's official account was from March 16 and read: "I'm proud to nominate Chief Judge Merrick Garland to the Supreme Court."

President Obama's last tweet on his personal Twitter account, meanwhile, read this, from 14 hours ago: "Want to meet James Taylor in Chicago? Enter today for your chance."

Obama is in Cuba on a historic diplomatic trip.

Politico reported key administration officials, including Obama, had been briefed on the situation. A White House official said U.S. officials were staying "in close contact with their Belgian counterparts" and would release information as it became available.

State Department spokesman John Kirby put out a statement that read, in part: "The United States stands with people of Belgium. We are ready to support the investigation as appropriate."