Bombs exploded in a Mormon chapel and in the offices of two right-wing political parties, causing minor damage and no injuries, police said Monday. Authorities blamed a small radical leftist guerrilla group.

An anonymous caller told a news agency that the blasts Sunday were "an offensive" to protest a visit by President Bush. Bush began a five-nation South American tour in Brazil Monday and is scheduled to arrive in Chile Thursday.Police said the bomb at a Mormon chapel in Conchali, a northern Santiago working-class suburb, shattered windows.

Similar attacks occurred at the offices of two right-wing political parties in La Florida and San Miguel, two working-class districts south of the capital city. Police said the attackers were members of the Lautaro Front.