Police investigating the stabbing to death of Shipley grandmother Louisa Denby and stabbing of nine-year-old Jason D’Arcy on Monday have now released four men, aged 18, 24, 26 and 29, from custody without charge.

The 26-year-old grandson of Mrs Denby, 84, remains in custody on suspicion of her murder at the home they shared in Prospect Mount, Windhill, and the attempted murder of Jason at the skate park at Windhill recreation ground.

He is also been quizzed about a third incident in which a eight-year-old girl was chased by a man in the garden of her home in Prospect Grove, Windhill, also on Monday.