The Brussels attacks have left the country of Belgium and many around the world devastated - here's how the leading presidential candidates are reacting.

Brussels has been hit with what authorities are calling terrorist attacks. Explosions at Brussels' international airport and a subway station close to European Union institutions have left over 30 people dead and hundreds injured.

One suicide bomber was behind an explosion at the airport, but multiple attackers were reportedly involved.

As the world watches for more updates, many of the remaining U.S. presidential candidates in the race have weighed in and offered their thoughts on the attacks.

Donald Trump, the Republican frontrunner, offered his candid thoughts on the Brussels attack just after 8 a.m. ET.

He also called in to Fox News:

Ted Cruz posted a lengthy message on his official Facebook page this morning as well:

John Kasich offered his own thoughts and prayers for the victims:

Democratic frontrunner Hillary Clinton also sent out a message on Twitter:

Bernie Sanders made the following statement regarding Brussels.

Stay with Enstars for more updates on the Brussels attacks.