Investigations are continuing following the death of a Keighley man as he fled from police.

Allen Mervyn Duffy was running away from officers in the Becks Road area of the town when he collapsed after consuming an unknown substance.

Police and paramedics unsuccessfully tried to resuscitate him.

The death has been referred to the Independent Police Complaints Commission.

Anyone who witnessed the incident -- which happened at about 10.25am last Thursday -- or saw 33-year-old Mr Duffy around that time, is asked to come forward.

Becks Road was sealed off following the incident and it remained closed for much of the day, and members of the police major inquiry team were brought in.

Police officers had been conducting enquiries into a drugs-related matter in the area when they spotted Mr Duffy.

A spokesman said: "Upon seeing the police, he ran off along Becks Road and in doing so consumed a quantity of an unknown substance, subsequently becoming unconscious.

"Attempts were made by officers to resuscitate him and paramedics were called.

"The man was pronounced dead at the scene. Enquiries are ongoing.

"WYP Professional Standards Department has been informed and the incident has been referred to the IPCC."

Deaths are normally referred to the IPCC if police are in contact with the person when he or she dies, or have had recent contact with that person

A post-mortem examination was carried out on Mr Duffy last Thursday and an inquest into his death will be held once toxicology tests have been completed. The Coroner's Office said this week that no date had yet been fixed for the hearing.

Witnesses to the incident are asked to phone the Keighley Police helpdesk on 01535 617059.