UPDATE: 3 LDS missionaries from Utah, military family injured during explosion in Brussels airport...
Several Americans are among the casualties of the attacks at an airport and metro stration in Brussels on Tuesday.
Mormon church officials say three missionaries from Utah were seriously injured.
The Church of Jesus Christ of Latter-day Saints issued a statement Tuesday identifying them as 66-year-old Richard Norby of Lehi, 20-year-old Joseph Empey of Santa Clara and 19-year-old Mason Wells of Sandy.
A U.S. official told CBS News correspondent David Martin an American military family was among the injured.
In a statement, the Department of Defense said: "One U.S. service member and his family who were caught up in this tragedy. Due to privacy concerns, we are not releasing the status of their injuries at this time."
Defense Department and U.S. Embassy officials tell CBS News they expect the number of American casualties in Brussels will go higher. CBS News correspondent Margaret Brennan reports U.S. State Department officials say they expect casualty totals to rise because this is a mass casualty event and there are many Americans who work in Brussels.
The missionaries were near one of the explosions in the airport when it occurred and have been hospitalized.
The three men were serving in Paris and were at the airport with a fourth missionary who was on her way to an assignment in Ohio.
Former Oakland University basketball player Sebastian Bellin, a Brazilian, was among the injured, his dad confirmed to CBS News.
Jean Bellin, who lives in San Clemente, Calif., said Sebastian told him he was on the floor in the airport for about an hour and lost a lot of blood. He is expected to undergo another procedure tomorrow. The company that Sebastian works for Keemotion video.
Belgian officials say at least 31 people were killed Tuesday and 187 wounded in two explosions at the Belgium airport and one at a city subway station.
The U.S. Embassy in Brussels is recommending that Americans in Belgium stay where they are and avoid public transportation. The embassy noted Tuesday that with the threat rating in Brussels at its highest alert, attacks can take place with little or no notice. It urged U.S. citizens to monitor media reports, follow instructions from the authorities, and "take the appropriate steps to bolster your personal security."