The vandals, whose identity is still unknown, set fire to at least one of the churches in the nation’s capital city and tossed pamphlets on the street as they fled.
One of the pamphlets read: “Pope Francis, the next bomb will be in your robe.
“One has the right to protest, but it’s a different thing entirely to use violence,” Interior Minister Mahmud Aleuy said on Friday after inspecting the damage inflicted on the churches.
Francis, who hails from Argentina and is the first Latin American pope, arrives in Chile on Monday.
A Mass he has planned to hold on Tuesday in a Santiago Park is expected to attract more than 500,000 people.
Protests on issues ranging from indigenous rights to the Church’s ongoing sexual abuse scandal are expected.
Francis will also visit the south-central city of Temuco and Iquique, which is farther north, before heading to Peru, where he will stop in Lima, Puerto Maldonado and Trujillo.