Tonnes of asbestos-contaminated waste have been dumped in a suburban Sydney street with authorities involved in a delicate clean-up operation as police hunt for the culprit.

Firefighters noticed several tonnes of the potentially deadly material when they and police were called to Chester Hill about 1am on Monday, following reports of the dumping.

The Environment Protection Agency says it is investigating the incident, while anyone with information about the incident, or with dash-cam footage of a tip-truck in the area at the time is asked to alert authorities, police said.

 

By Hannah Higgins