This was the scene a short while ago, between the Arts-Lois and Maelbeek metro stations in Brussels. pic.twitter.com/aTZjqsF7Gt

— Evan Lamos (@evanlamos) March 22, 2016

A surveillance photo released hours after the attack showed three men whom Belgian authorities identified as possible suspects in the airport bombing.

Police released a public bulletin saying they are searching for the man in the light jacket and dark hat and asked for public assistance in finding him.

\"PHOTO:
Belgian Federal Police/AFP/Getty Images
PHOTO: An image made from a security camera and released on March 22, 2016 by the Belgian federal police shows what the police say are possible suspects in the Brussels airport attack.
>

Meanwhile, President Obama addressed the attacks while on a trip to Cuba, saying Americans \"stand in solidarity\" with Belgian people and that the United States will \"do whatever is necessary to support our friend and ally Belgium in bringing to justice those responsible.\"

The subway system has been closed entirely and Brussels airport officials have been advising people not to travel to the airport.

\"PHOTO:
Francois Lenoir/Reuters
PHOTO: Broken windows seen at the scene of explosions at Zaventem airport near Brussels, Belgium, March 22, 2016.
>

\"This is the worst attack that our country has known,\" Belgian Prime Minister Charles Michel said this afternoon.

\"Freedom was attacked in its heart, like it was attacked in Paris, in London, and in Madrid. This is a fight we are fighting together,\" Michel said. He went on to say that more security measures will be announced Wednesday.

\"PHOTO:
AP
PHOTO: A map from the Associated Press shows the locations of the Brussels airport and Maelbeek metro station in Belgium.
>
\"PHOTO:
Ketevan Kardava/ Georgian Public Broadcaster via AP Photo
PHOTO: Two women wounded in Brussels Airport in Brussels, after explosions were heard, March 22, 2016.
>

The explosions come as Abdeslam, a suspect in the Paris attacks, was detained last week in Belgium by Belgian authorities.

The attacks prompted an international response, with senior law enforcement officials in the United States confirming to ABC News that Homeland Security and FBI officials are monitoring closely. New York Police Department officials have also confirmed that they are monitoring the situation closely.

\"PHOTO:
Geert Vanden Wijngaert/AP Photo
PHOTO: People react as they walk away from Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016.
>

A senior U.S. official told ABC News that U.S. Transportation Security Administration chief Peter Neffenger happened to be in Brussels and was actually on airport grounds at the time of the bombing there. He is in a safe place, the official said.

\"PHOTO:
Emmanuel Dunand/AFP/Getty Images
PHOTO: A security perimeter has been set, on March 22, 2016 near Maalbeek metro station in Brussels.
>

NATO, which is headquartered in Brussels, announced that it is increasing its \"alert state,\" after decrying the \"cowardly attack.\"

\"PHOTO:
Laurent Dubrule/EPA
PHOTO: Passengers and airport staff are evacuated from the terminal building after explosions at Brussels Airport in Brussels, March 22, 2016.
>

The French Interior Minister confirmed that 1,600 extra police officers have been deployed near French transportation hubs in the wake of today's explosions.

France had already sent out an extra 500 extra police near the country's borders after Abdeslam was arrested last week.

\"PHOTO:
Francois Lenoir/Reuters
PHOTO: People leave the scene of explosions at Zaventem airport near Brussels, Belgium, March 22, 2016.
>
\"PHOTO:
Emmanuel Dunand/AFP/Getty Images
PHOTO: A victim receives first aid on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries.
>

The French Army posted a message of support for Belgium on Twitter, along with a photo of soldiers with heavy weapons at what appears to be a transportation hub.

\"More than ever, the French army is mobilized against the terrorist threat. We will win this war,” Gen. Pierre de Villiers said in a quote posted on the Army's Twitter account.

\"PHOTO:
Francois Lenoir/Reuters
PHOTO: People in thermal blankets are driven from the scene of explosions at Zaventem airport near Brussels, Belgium, March 22, 2016.
>

The Metropolitan Police in London have released a statement confirming an increase in deployment, saying that \"forces across the U.K. have increased policing presence at key locations, including transport hubs, to protect the public and provide reassurance. This is not in relation to any specific information or intelligence.\"

So has the U.S. Embassy in Brussels, releasing a statement urging U.S. citizens to shelter in place and avoid all public transport.

Get real-time updates as this story unfolds. To start, just \"star\" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here.

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