Four 17-year-old boys held on suspicion of murder and others detained on suspicion of assisting an offender
Seven people have been arrested after a murder investigation was launched into the fatal stabbing of an 18-year-old man in Derbyshire, police said.
East Midlands ambulance service contacted police at 8.20pm on Saturday to report that a man had been stabbed on Rose Avenue in the town of Ilkeston.
