Shocking crash leads to carjacking
Tunnel security cameras have shown the dramatic moment two cars crash at high speed, sending one rolling.
Police said just before 12.30am Saturday two cars - a Mazda and Range Rover - were involved in a collision in the M5 tunnel near the intersection of Marsh Street, Arncliffe, in Sydney.
They said when two men from a Honda that wasn't involved in the crash stopped to help, five men from the Mazda then entered the Honda.
Police said they were told the men threatened the driver of the Honda with a knife, before driving away towards Marsh Street.
No one was injured as a result of either incident.
Investigators are appealing for anyone who sees a black Honda Accord sedan with NSW registration 'EDB35X' to not approach the occupants, but to contact triple-0 or Crime Stoppers.
Inquiries by officers from St George Police Area Command into the incidents are continuing.