Hamza bin Laden, son and would-be heir of late Al-Qaeda leader Osama bin Laden, has urged Muslims around the world to join the flight in Syria against “crusaders” and Shia Muslims.

“The cause of Syria is the cause of the entire worldwide Muslim community,” he said in an undated audio recording released on militant networks on Thursday.

“In order for the people of Syria to resist the crusader, Shia and international aggression, Muslims – all Muslims – must stand with them, support them and give them victory,” he said.

“Wakefulness is essential, as is quick, serious and organised movement, to support the people of blessed Syria before it is too late.”