Preliminary data based on the notification from the Hong Kong authorities:
After take-off, ECAM warnings and the associated messages of Green and Blue hydraulic systems pressure low appeared. The flight crew declared MAYDAY and decided to return to VHHH for a full emergency landing. The aircraft landed on runway 25L of VHHH and became disabled for about one hour and forty five minutes with No.5 tyre burst. After being replaced with serviceable wheel assembly, the aircraft was towed to a parking bay.