Story highlights President Barack Obama reacts to Brussels terror attacks

Obama is in Cuba for first visit of a sitting U.S. president since 1959

(CNN) The U.S. will do whatever it can to help Belgium bring to justice those responsible for Tuesday's terror attacks, President Barack Obama declared Tuesday.

Obama urged international unity in the fight against terror after the attacks left at least 34 people dead.

"We will do whatever is necessary to support our friend and ally Belgium in bringing to justice those who are responsible," Obama said in brief remarks while in Cuba, where he was making an address to the Cuban people after his administration ended decades of estrangement between the two countries.

The President said that the thoughts and prayers of Americans are with the people of Belgium, "and we stand in solidarity with them in condemning these outrageous attacks against innocent people."

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