Overall at least 26 people are dead and at least 55 were injured following the attacks that struck an airport and a metro station.
The Americans that were injured were from Utah: Elder Richard Norby, 66, of Lehi; Elder Joseph Empey, 20, of Santa Clara; and Elder Mason Wells, 19, of Sandy.
The trio were missionaries with the Church of Jesus Christ of Latter-day Saints, according to NBC News. They were reportedly dropping off another missionary when the explosion hit the airport.
NBC reports that for one of the missionaries, this wasn't his first brush with a terror attack. According to family members, Elder Mason Wells was also in Boston to watch his mother run the Boston Marathon in 2013.
Wells was also in Paris in November when the capital of the country was attacked by terrorists.
Norby’s son-in-law spoke with NBC News saying that Norby was wounded in the leg but alive.
"She spoke to him once at the airport and he told her that he was hurt," Brian Allred told NBC. "His wife was on a mission with him but was attending to other things at the time."
NBC News reports that the trio were at Zaventem Airport escorting a fourth missionary, Sister Fanny Rachel Clain, 20, of Montélimar, France. She was heading to a missionary assignment in Ohio and had already passed through airport security when the blast went off.
Also regarding the Brussels attack, U.S. military officials confirmed with NBC that a U.S. service member and four members of his family were wounded. The names and conditions of these people were not released. NBC says one military official does not believe that their injuries are life-threatening.