Some crimes are best left unsolved: Brother of two British ISIS fighters killed in Syria is stabbed to death in Brighton

The brother of two British teenagers killed fighting for Islamists in Syria has died in hospital after being stabbed in a car after it crashed.

Abdul Deghayes, from Brighton, died in the early hours of Sunday morning in the East Sussex city, Sussex Police confirmed as they announced they had launched a murder investigation.

The 22-year-old was found just before 9.30pm on Saturday in the passenger seat of a silver Volkswagen Polo which had crashed into other cars, police said.