New York  - US President George W Bush, in his final speech before the United Nations on Tuesday, called on the world to unite in the fight against extremism and terrorism.

Addressing the UN General Assembly in New York, Bush said it is not enough to condemn acts of terrorism that have already occurred, but instead the international community "must continually confront terror."

"Like slavery and piracy, terrorism has no place in the modern world. Around the world nations are changing these words into action," Bush said.

"Terrorist acts are never legitimate" and as the threat of terrorism grows "joint actions have spared citizens from many devastating blows," he said. (dpa)