A man is in critical condition following a stabbing at a mosque in Bradford.
Emergency services rushed to the Islamic Centre on Newton Street following reports of a knife attack at 10.06am on Monday.
A man in his 20s was taken to hospital for treatment with life-threatening injuries.
Another man from a nearby address has been arrested and remains in police custody in relation to the incident.
Both the victim and suspect had attended the Islamic Centre separately prior to the attack.
The matter is not being treated as a hate or terrorist-related incident at this time.
Chief Superintendent Rob McCoubrey of Bradford Police said: “Detectives are conducting a number of enquiries into this serious incident today and a man remains in police custody after being arrested in connection with the attack on the victim.
“We are not seeking anyone else in connection with what took place and local NPT officers are conducting reassurance patrols and speaking with residents in the local area.
“This is clearly a distressing incident for the victim’s family and local community and West Yorkshire Police will continue to provide visible reassurance and support as the investigation progresses. "