Police investigating an stabbing in Shipley believe it could have been filmed by people on their mobile phones.
The attack, in which a 38-year-old man was stabbed, happened outside a pub in Crag Road at around 6.30pm on Wednesday, 21 August.
He remains in hospital in a stable condition.
It is not yet known what he was stabbed with.
Two men, aged 39 and 33, who were arrested on suspicion of assault have been released on bail pending further enquiries. A 35-year-old man and a 38-year-old woman who were also arrested on suspicion of assault have been released without charge.
A 26-year-old man accused of murdering his 84-year-old grandmother and stabbing a nine-year-old boy in a skate park has been remanded in custody.
Nathaniel Flynn, 26, of Prospect Mount, Shipley, is accused of stabbing to death retired teacher Louisa Denby, who lived at the same address.
Police were went to the house on Monday night as they were investigating the stabbing of a nine-year-old boy in nearby Carnegie skate park. Mrs Denby suffered a number of stab wounds, officers said.
Flynn has also been charged with attempting to murder the boy, who cannot be named for legal reasons.
Flynn also faces charges of possessing an offensive weapon and assault following another incident on Monday in which a 59-year-old man was attacked with an iron bar outside his home in the Idle area of Bradford.
He stood in the glass-fronted dock at Bradford Magistrates' Court today flanked by two security guards for a three-minute hearing. he was remanded in custody until July 9 when he will appear at Bradford Crown Court.
A 26-year-old man will appear before Bradford Magistrates this morning, charged with murder and attempted murder. Nathaniel Flynn is charged with the murder of 84-year-old Louisa Denby and the attempted murder of a nine-year-old boy in Shipley on Monday.
He is also charged with the assault of a 59-year-old man and with possessing an offensive weapon.