The Islamic Religious Council of Singapore (Muis) on Saturday, denounced the bomb blasts at the recent Boston Marathon.
The Boston blasts on Monday had killed three people and injured 176.
An unprecedented armed standoff with two terror suspects ended early Saturday.
A second terror suspect, a 19-year-old youth of Chechen origin, was captured alive. The first suspect was killed in an earlier confrontation with police.
"Muis stands alongside people of all faiths and the global community in opposing such heinous acts wherever they occur," said president Alami Musa in the statement.
"It is a crime against humanity which had caused the loss of innocent lives. We send our deepest condolences to the families of those who perished and pray for the speedy recovery of those who were injured," he added.