A third man has been arrested following the death of an off-duty police officer in Edgeley, Stockport.
The officer, 28-year-old PC Gareth Francis, was walking home from a night out with friends when he was assaulted.
Two men aged 20 and 21, both from the Stockport area, had previously been arrested on suspicion of his murder and remain in police custody for questioning.
A third man, aged 20, was arrested on suspicion of murder on Sunday night. He also remains in custody for questioning.
More top news
Between 4,000 and 8,000 fighters of the so-called Islamic State are still thought to be in the area.
Police are trying to find the driver of the car following the incident in Kingfisher Close, Brownhills.
An unnamed man died at the scene, while a woman was pronounced dead after being taken to St George's Hospital, Tooting, south-west London.