A 13-year-old boy has allegedly been accosted by a man while riding his bicycle in Hornsby.
The man allegedly grabbed the boy's arm and asked him numerous questions about 7.15pm on Monday.
The boy shook the man off, suffering minor injuries in the process, and cycled away. The man is said to have followed the boy for a short distance.
Police wish to speak to the man described as Caucasian in appearance, with a tanned complexion, a thin build, tall, aged in his 50s, with long blond hair and a slight droop on the right side of his mouth.
The man was last seen wearing a black T-shirt with the letters DKNY, tracksuit pants with a tear in the rear and sneakers with torn sides.