SANTIAGO, Chile (AP) _ Bombs exploded at five Mormon chapels in Santiago Tuesday night and early Wednesday, causing damage but no injuries, a church spokesman reported.

The overnight blasts in suburban working class districts brought to 31 the number of chapels of the Church of Jesus Christ of Latter-day Saints bombed in the last 12 months, according to Humberto Barrientos, a church spokesman.

No one claimed responsibility for the latest explosions, but in previous attacks police found at the scene pamphlets of the Manuel Rodriguez Patriotic Front, a leftist guerrilla group. In the pamphlets, the front said it bombed the churches because, it said, the Mormons are ''a yankee Church.''

''Our is a universal church and, in Chile, 70 percent of our missionaries are Chilean,'' Barrientos said.