The White House condemned the deadly terror attack that struck a bus of Israeli tourists at an airport near the Bulgarian city of Burgas.
Between three and seven people are believed to have been killed in the powerful blast. The explosion was a terror attack, according to Bulgarian authoritles.
The United States "condemns such attacks on innocent people, especially children, in the strongest possible terms," White House press secretary Jay Carney said, as cited by international media.
President Barack Obama's thoughts and prayers are with the families of those killed and injured, he added.
Carney declared that the US stands with the Israeli people and the people of Bulgaria. He stated the Obama administration was working to learn all the facts in the case but the US 's "commitment to Israel's security remains unshakeable."