A PROVOCATIVE billboard carrying the slogan ''Jesus: a prophet of Islam'' has been vandalised one day after it was posted on one of Sydney's busiest roads.

The billboard is one of three paid for by an Islamic group called MyPeace and features a phone number for people to call to receive a free Koran and other Islamic literature.

Unwanted message ... the billboard on Victoria Road. Credit:Dean Sewell

The organiser of MyPeace, Diaa Mohamed, said the vandalism of the billboard at Victoria Road, Rozelle, ''validates the reason they went up in the first place''.

Since the billboards were erected in Darlinghurst, Rozelle and Rosehill on Thursday and Friday, and featured in the Herald on Saturday, Mr Mohamed said he had been inundated with phone calls and emails.