"We condemn without reservation this senseless act of violence," the embassy said.
"The U.S. Federal Bureau of Investigation’s regional representative is currently assisting the Maldivian authorities in their investigation."
Maldivian home minister Abdullah Kamaldeen had told parliament that two foreigners and several teenagers had been arrested in connection with the bombing, media reports said.
The minister had told parliament that the SIM card of a mobile phones used to detonate the bomb had been found and its previous calls have been traced. .