Hong Kong: The most visible face of Hong Kong's peaceful variety of protest marches, Jimmy Sham, was left on a road in a pool of blood after being attacked by men with hammers on Wednesday night.

Sham, 32, convenor of the Civil Human Rights Front, was treated by ambulance officers for serious head wounds before being taken to hospital. Police closed the road at the scene of the attack in Mong Kok.

Jimmy Sham arrives at hospital after he was attacked with hammers in Hong Kong. Credit:AP

Sham remained in hospital in a stable condition on Thursday afternoon. His Facebook account said he had sent a message that an independent inquiry was needed to investigate all violent incidents since the protests started in June.

Sham also called for calm in Hong Kong.