Detectives are appealing for members of the public to help them following a weekend of violence in Huddersfield.
Officers are studying CCTV footage and interviewing victims today following a nightclub stabbing and two separate machete attacks.
The police have as yet been unable to identify any suspects in the Tokyo nightclub attack, Queen Street, in which one man was stabbed in the face and another in the groin between 2am and 3am on Sunday.
The two victims, aged 18 and 21, have both since been released from hospital.
Det Insp Andy Leonard, of Huddersfield CID, said: “As yet no suspects have been identified, but the CCTV work is continuing.
“The nightclub was packed and we are appealing for witnesses.”
The stabbings followed two machete attacks, of which Det Leonard said: “Despite the similarity of the weapon used in the two attacks, there is no established link between them.
“We would like anybody who has any information, or who saw or heard anything, to come forward.”
The first happened at 11.50pm on Friday in Bradford Road, near the Texaco filling station on Huddersfield town centre ring road.
A group of men attacked a 42-year-old man, whose back, head and hands were injured.
He was taken to Leeds General Infirmary and has since been released. Detectives are interviewing him this afternoon.
At 10.25am on Saturday, an ambulance crew called police to a house in Garforth Street, Aspley, after a 32-year-old man was attacked with a machete, leaving him with shoulder injuries.
Police are today still searching for the suspect, who is known to them.
Anyone with information should ring 101 and ask for Huddersfield CID.
In unrelated investigations, police would like to speak to the people pictured in the image gallery below. The people pictured in the images may be witnesses as well as suspects. If you recognise anyone, contact police on 101 quoting the reference number on the image caption.