A bomb exploded at the Peace Corps headquarters in Honduras before dawn Monday, damaging the building but causing no injuries, U.S. and Honduran officials said.

There were unconfirmed radio reports that a Honduran rebel group, thought to be inactive, placed the bomb at the headquarters."At about 3:50 a.m., a bomb exploded at the headquarters of the Peace Corps. The bomb caused material damage, but no one was injured," the U.S. Embassy in Tegucigalpa said.

The statement said no one has claimed reponsibility for the attack, but Nicaragua's official Sandino Radio and local radio stations reported that a Honduran rebel group, the April 7 Martyrs of the Patriotic Front, claimed responsibility for the attack in a phone call to Radio America.