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A Kuala Lumpur police officer inspects the damage to the Metro Tabernacle Church which was destroyed by a fire bomb a little after midnight in the Kuala Lumpur suburb of Desa Melawati, Friday, Jan. 8, 2010. Image Credit: AP

Kuala Lumpur: Assailants have attacked three Malaysian churches with firebombs, extensively damaging one amid a growing conflict over the use of the word "Allah" by non-Muslims, officials said.

Friday's attacks sharply escalated tensions in the Muslim-majority country ahead of planned protests by Muslims later Friday against a Kuala Lumpur High Court verdict which struck down a 3-year-old ban on non-Muslims using "Allah" in their literature.

The Dec. 31 court decision incensed many Muslims.

Hateful comments and threats against Christians have been posted widely on the Internet, but this is the first time the controversy has turned destructive.