Volunteer and professional firies from the Coast have sped down the M1 today, to play their part in the operation to control a massive bushfire burning south of Sydney.
Fire and Rescue and RFS Crews from Kariong, Terrigal, Copacabana, Hamlyn Terrace and Wyoming are among the 500 firefighters and 100 trucks fighting the flames in Holsworthy, Moorbank, Heathcote, Wattle Grove, Menai, Sandy Point and Alfords Point.
They've been involved in property protection among other jobs.
The blaze flared up around Casula yesterday afternoon and intensified again this afternoon.
Police now say they're treating the fire as suspicious, and are investigating the cause. Reports say the unseasonably hot weather of the last few weeks are partly to blame for its spread.
The latest update says the fire's more than 2400 hectares in size, and has burnt an unknown number of houses and part of a military barracks.
The flames briefly shut a section of the T8 train line, while several roads remain closed.