Police are investigating after a man in Sydney Mines says he was deliberately struck by two boys driving an ATV.

Police say a man and a woman, both in their late 50s, were walking in woods near the bottom of George Street Monday.

They say an ATV with two boys passed the couple, splashing them with mud. 

Police say after a conversation with the couple, one boy started throwing rocks at them.

They say the boys then drove at the man, striking him and knocking him into the bushes, before driving off.

The man was treated in hospital for his injuries.

Police are looking for the two riders, between 13 and 15 years old. They were wearing black helmets and black jackets.