Three more people have been arrested in connection with the murders of two 17-year-old boys at a house party.
Dom Ansah and Ben Gillham-Rice were stabbed by masked attackers in Milton Keynes on October 19.
A 15-year-old boy from Milton Keynes was arrested yesterday on suspicion of two counts of murder, police said.
A 53-year-old man and a 40-year-old woman, also from Milton Keynes, were arrested on suspicion of assisting an offender. All three remain in custody.
The 15-year-old faces two additional counts of attempted murder.
Ryan Brown (23) and a 17-year-old boy who cannot be named for legal reasons were also stabbed in the attack and have serious but non-life-threatening injuries.
Three others have been charged. Earl Bevans (22), of no fixed address, Charlie Chandler (21), of Fitzwilliam Street, Bletchley, and a 16-year-old boy who cannot be named due to his age are accused of two counts of murder and two counts of attempted murder.
The three have been remanded in custody and will appear at Luton Crown Court in January.