A man has died and another is in a critical condition in hospital after a triple stabbing in Halifax.
Police were called to Commercial Street at 3.48am on Sunday 1 October where the three men had reportedly been assaulted.
One of the men died in hospital and one of the other men is described as being in a critical condition. The third man has received treatment for a non-life-threatening injury.
West Yorkshire Police say they have a "significant police scene" in the town centre as they "conduct specialist searches and forensic enquiries."
Shadow Home Secretary Yvette Cooper, who is also a West Yorkshire MP, called for more action from the government on knife crime after the incident.
She said: "The news of another fatal knife attack in Halifax is terrible - close on the heels of the attacks in Leeds, and the killing of a schoolgirl in Croydon. My thoughts are with all those affected.
"We cannot simply stand by as our communities continue to be blighted by rising knife crime. It is taking too many young lives. Urgent action is needed by Government to prevent and crack down on this dangerous and devastating crime before more lives are lost."
A police cordon remained in Halifax town centre for most of the day.
The Rvd Canon Hilary Barber from Halifax Minster gives his reaction to the triple stabbing
Officers thanked the public and local businesses for their patience while they continue their investigation.
The Vicar of Halifax Minster Revd Canonn Hilary Barber said the town had been shocked by th incident.
He said: "Clearly we're very shocked to hear this tragic news for all the families who are involved and the emergency services who are there now to care for people.
"Halifax is one of the safest places to live in the UK which makes this all the more shocking. If it'd been in one of our major cities sadly maybe we would have expected it. But here this is not the norm. This is something which is extra-ordinary."