GAZA, May 16 (Reuters) - A bomb exploded outside a Christian school in the Gaza Strip on Friday, causing damage but no injuries, witnesses said.

There was no immediate claim of responsibility for the blast, which ripped through the gate of the Rosary Sisters School in the Hamas-controlled Gaza Strip shortly before dawn.

The school was also targeted by masked gunmen last year shortly after Hamas Islamists took control of the coastal territory in June. The school was torched and looted in that incident.

Over the past two years, there have been a rash of attacks targeting U.N.-run schools, the American International School, Internet cafes and video stores.

Analysts have blamed radical Muslim groups with links to al Qaeda for the attacks.

The Gaza Strip is home to some 3,000 Christians. (Reporting by Nidal al-Mughrabi; Writing by Joseph Nasr; Editing by Alison Williams)

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