A gang of Sydney street thugs has been throwing faeces at their victims to distract them before robbing them, police say.

Police say the men hurl excrement at their victims and fleece them just after they withdraw money from financial institutions.

Police have released CCTV images of a number of males who may be able to assist them with their investigation.

"These robberies are vile and sickening in their nature and we are doing everything we can to catch those responsible," Burwood crime manager, Detective Inspector James Deeley, said today.

An 82-year-old man had more than $8000 taken from his pocket just after he and his wife withdrew money from a bank in Wareemba, in Sydney's inner west, on April 12.