Palestinians using guns and firebombs have attacked five churches in the West Bank and Gaza Strip.
The attacks on the Anglican, Greek Orthodox, Roman and Greek Catholic churches follow a day of protests in the Middle East and South Asia against Pope Benedict's repetition of a centuries-old quote that linked Islam with violence.
A group called the Lions of Monotheism claimed responsibility for two of the firebombings in Nablus. No one was hurt in the attacks.
Palestinian Christian leaders have played down the attacks as isolated incidents.
The Christian mayor of Palestinian-ruled Bethlehem Victor Batarseh says relations between Muslims and Christians are good.
On Friday, witnesses in the Gaza Strip say a small explosion caused minor damage outside a Greek Orthodox church. No one was injured in that blast.