(VOVworld) – A State Department official confirmed Sunday the deaths of two more US citizens in last week’s Brussels suicide bombings, which increases the number of American casualties to four. US authorities say at least ten American citizens were injured in the attacks.

A Belgian police officer takes part in an anti-terrorist operation in Brussels. (Photo: AFP)

The recent attacks in Brussels’s Zaventem airport and Maelbeek subway station killed thirty people and injured hundreds more. Belgian authorities say this was the worst attacks in Belgium since World War II, a sign of the growing threat of terrorism facing Europe. European investigators are hunting for at least 8 suspects, most of them French or Belgian.