Several U.S.-based associations have offices in Brussels, but no group contacted by CEO Update said they had staff harmed in the terrorist attacks that reportedly left more than 30 people dead Tuesday.

Among the groups with a substantial office in Belgium's capital is the Computer & Communications Industry Association. Heather Greenfield, director of communications for CCIA, said the association's Brussels employees let their Washington, D.C., counterparts know early on that they were okay.

"They sent an email early this morning confirming everyone was accounted for and that they would be working from home," she said in an email.

Brussels is a hub of association activity in Europe as the location of many European Union institutions. Twin blasts hit Brussels Airport and a metro station near EU headquarters around 7 a.m. GMT, BBC News reported. The Islamic State has claimed responsibility.

Cruise Lines International Association also has a Brussels office, and a spokeswoman told CEO Update tits staffers are safe. The Trans-Atlantic Business Council also reported that none of its Brussels employees had been hurt.

"They heard the news and decided to work from home today," said Hilary Sama, events and communications director for TABC.

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