Police in the North investigating a murder in Belfast have released a photo of a knife similar to one which they believe was used in an attack.

It is almost 14 inches long and has distinctive orange and white markings.

Police believe a similar knife was used to stab Jennifer Dornan (30) before her home was set on fire in Dunmurry on Sunday.

Police believe the killer tried to cover their tracks by setting fire to her house.

Ms Dornan - a mother of three - had been on a night out with friends at the Devenish complex on Finaghy Road North last Saturday night.

Police say they left at around 1:30am and went back to a friend's house close to her own home.

At 3am she left her friend's house and walked the short distance home.

Detective Superintendent Kevin Geddes said: "We are appealing to anyone who has come across a knife like this since Sunday to contact us. We are grateful to the community for the enormous amount of assistance they have provided in the past few days and would ask for their continued support."

He added that they are following "a definite line of enquiry".

A man (39) arrested yesterday on suspicion of withholding information about the murder has been released, pending a report to the North's Public Prosecution Service (PPS). 

Detectives issue image of weapon similar to that used to attack murder victim Jennifer Dornan http://t.co/uChEXTPqoN pic.twitter.com/9F5cjrTjOH

— PSNI (@PoliceServiceNI) August 6, 2015