U.S. Secretary of State John Kerry says that Americans were among those killed in Tuesday’s terror attacks in Belgium’s capital, which killed at least 31 people and injured hundreds more.

Speaking in Brussels on Friday, Kerry said he was grieving with “the loved ones of those who have been very cruelly taken from us — including Americans.”

It’s the first confirmation of American deaths in the attacks.

The Associated Press, citing an anonymous official, says that the families of two Americans have been notified of their deaths.

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More details about the American victims aren’t yet known.

China has also announced one of their citizens was killed in the attacks.

Tuesday’s bombings struck the Brussels airport and a metro station, and were later claimed by ISIS. Some of the suspected bombers have been identified by police; others are still being pursued by authorities.

Belgian authorities haven’t released details about any victims in the attack, but some information has been made public by other countries and by individuals. We’ve rounded up some of what’s known about the victims here.

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