What kind of sick individuals??

[MAD]

http://news.ninemsn.com.au/national/...ear-crash-site

NSW police have recovered empty oil cans from bushland in Sydney's Royal National Park near a bend where three cars lost control and crashed after driving over a deliberately left slick.

Three cars were travelling along Sir Bertram Stevens Drive after 11pm (AEDT) on Saturday when they lost control while navigating a sharp bend and crashed into trees.

A driver and passenger from one of the vehicles were taken by ambulance to St George Hospital with minor injuries.

Investigators believe up to 40 litres of oil had been deliberately poured over a 100m stretch of the road near Warumbul Road.

Police have now recovered two oil cans near to the scene of the crashes.

"We've found two oil cans that were thrown into the bush near to where the oil was poured and we've seized them for forensic examination," a police spokeswoman told AAP on Monday.

Anyone who witnessed any suspicious activity in the area is asked to contact Crime Stoppers on 1800 333 000.