Police have named a man they are looking for in connection with the fatal stabbing of a woman in Bradford city centre.
Habibur Masum, 25, is wanted after the attack in the Westgate area at 15:21 BST on Saturday.
The 27-year-old woman later died in hospital.
West Yorkshire Police said a knife was found at the scene but it is not clear if Mr Masum is armed.
He is from the Oldham area and described as Asian and of a slim build, a force spokesperson added.
Mr Masum has been pictured on CCTV wearing a duffle coat with three large horizontal lines of grey, white and black, light blue or grey tracksuit bottoms with a small black emblem on the left pocket and maroon trainers.
A witness also reported seeing him wearing a grey hoody with the hood up after the incident on Westgate's junction with Drewton Road.
Det Ch Insp Stacey Atkinson said: "We have had significant resources following up a number of lines of inquiry to locate Habibur Masum but at this time his whereabouts are unknown.
"I would urge anyone who does see him not to approach him but to call 999 immediately."
He is also believed to have links to the Burnley and Chester areas.
Det Ch Insp Atkinson said the death of a young woman in "such shocking circumstances" has caused "considerable concern" in the local community, adding that residents could expect to more police officers in Bradford.
