Police on Thursday were investigating a knife attack at a fast food restaurant in Sha Tin.

A man, 43, was arrested after the incident on Wednesday evening at a Fairwood restaurant in Shui Chuen O Plaza.

A female employee suffered injuries to her arm and face, while a colleague and a man who intervened in the attack on her were left with neck and face injuries.

The three injured people were taken to hospital, along with the suspect and a customer in the restaurant who was frightened by what happened.