Both Israel and Egypt have closed their borders with Gaza since the Islamic militant group Hamas violently seized control of the Palestinian territory in June 2007. The closure deepened economic hardship in the already impoverished strip, home to 1.4 million Palestinians.It was bin Laden's second audio message on the Gaza offensive since January, when he urged Muslims to launch a jihad against Israel. It was not possible to verify the message's authenticity. A spokesman for Al-Jazeera refused to say how the network obtained the recording.The terror leader again urged Muslims to fight Israel."The Gaza holocaust, amid this prolonged embargo, is an important historic event and a catastrophe that shows the necessity of distinguishing Muslims from hypocrites," he said."It is not right that our situation after Gaza will be as it used to be before. There should be serious work and preparation for jihad to fulfill righteousness and defeat evil."