Secretary of State John Kerry, left, and Belgian Prime Minister Charles Michel give a joint statement at the Belgian Prime Minister's Residence in Brussels, Belgium, Friday, March 25, 2016. Kerry is in Brussels to pay respect to victims of terrorist attacks that left tens of people dead . (AP Photo/Andrew Harnik, Pool)

2 Americans confirmed dead in Brussels attacks; Kerry visits

At least two American citizens have been confirmed killed in this week’s attacks in Brussels, a U.S. official said Friday.