Kerry to travel to Brussels this week
© Francis Rivera
State Department spokesman John Kirby announced the trip Wednesday afternoon, saying that Kerry would also meet with Belgian and European officials. 

Kerry is in Moscow, where he arrived Wednesday for meetings with Russian and German officials. He'll sit down with Russian President Vladimir Putin on Thursday, their first meeting since the Russian leader announced a pullback of Russian forces in Syria earlier this month.

Western leaders including President Obama on Tuesday denounced the terrorist blasts at the Brussels airport and a subway station.

During the first day of his trip to Argentina on Wednesday, after being in Cuba the previous day, Obama called for the international community to come together to defeat terrorism after the latest attacks, for which the Islamic State in Iraq and Syria (ISIS) claimed responsibility. 

The State Department said earlier Wednesday that approximately a dozen Americans were among the injured. One U.S. service member and his family were also among those injured.

Updated at 1:35 p.m.