Police searching for a murder suspect have raided properties across the North West including Burnley.
A manhunt is underway for Habibur Masum, 25, who is from Oldham but has links to Burnley.
Kulsuma Akter, 27, also from Oldham, died after being stabbed on Westgate in Bradford city centre just after 3.20pm on Saturday.
Kulsuma was taken to hospital but subsequently died from her injuries.
She was with her young baby at the time of the incident - the baby is safe and was not harmed in the incident.
West Yorkshire Police Officer Assistant Chief Constable Damien Miller said: “There is significant resources conducting CCTV and house-to-house inquiries.
“And we also have local Bradford officers carrying out increased patrols in the area, which I hope will be of some reassurance to residents.
“With the support of other forces we’ve conducted a number of raids in the Burnley and Oldham and Chester areas in the search for Masum, and during the searches a 23-year-old man has been arrested on suspicion of assisting an offender and is now in police custody.
Masum and Kulsuma are known to each other, West Yorkshire Police said.
Extensive enquiries are underway to find Masum. He was captured on CCTV getting on a bus at Market Street in Bradford city centre at 3.30pm on Saturday
He then got off the bus at 3.42pm on Killinghall Road and walked towards Bradford Moor Park - this is the last known sighting of Masum.
He is Asian and of slim build.
He is 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. Masum has links to Burnley and Chester.
West Yorkshire Police revealed today that a 23-year-old man has been arrested in Cheshire on suspicion of assisting an offender and he remains in police custody.
Due to police having contact with Kulsuma prior to her death, West Yorkshire Police has referred itself to the Independent Office of Police Conduct.
'An absolutely tragic incident'
Detective Chief Inspector Stacey Atkinson, of West Yorkshire Police’s Homicide and Enquiry Team, said: "This is an absolutely tragic incident in which a mother has lost her life in the most horrific of circumstances.
“Over the weekend we have had significant resources following up extensive lines of enquiries to locate Habibur Masum but his whereabouts are unknown.
“The last known sighting of Masum was on CCTV at 3.42pm as he got off the bus on Killinghall Road and walked towards Bradford Moor Park.
“I would urge anyone who has seen him or who knows where he is not to approach him but to contact police immediately on 999.
“We understand that this has caused a considerable amount of concern in the local community. Local Neighbourhood Policing teams are patrolling the area conducting reassurance to the community."
How to report sightings
Any current sightings of Habibur Masum should be reported to police via 999.
Any other information that could assist the investigation should be reported via Live Chat online or by calling 101, quoting log 1071 of April 6.
Information can also be given to the Major Incident Public Portal via this link:
Information can always be given anonymously via Crimestoppers on 0800 555 111
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