A man armed with a knife killed at least three people Thursday at a church in Nice, France.Police wounded the attacker, who was captured and later placed in a hospital.The man repeatedly shouted "Allahu Akbar" -- the Arabic words for God is Greatest -- even after he was injured, said the city's mayor.This was the third attack in two months. French officials have blamed the attacks on Muslim extremists.The latest incident comes at a time of growing Muslim anger over cartoons of the Prophet Muhammad.They were republished recently in the French magazine Charlie Hebdo.The pictures are protected under free speech laws in France. Muslims, however, consider their publication insulting to God.Within hours of the Nice attack, French police shot and killed a man who threatened people with a handgun near the southern city of Avignon.Radio station Europe 1 reported that that gunman was also shouting "Allahu Akbar."