Four violently robbed on Kent and south London trains
Two men and two 16-year-old boys have been injured in a series of "deeply shocking and distressing" robberies on trains in Kent and south London.
Detectives have released a CCTV image of a man wanted for questioning in connection with all four attacks, but warned the public not to approach him.
It is believed the same man carried out each robbery with a different group of accomplices over a period of two weeks.
The attacks happened between 24 August and 8 September.
One of the 16-year-olds was the first robbery victim when he was approached by two men on the 2024 BST Gillingham to Charing Cross service.
One man demanded the boy, from Herne Bay, hand over his mobile phone and when he refused, he was hit in the face and body before having his eyebrow cut with a knife.
The second robbery took place on 6 September as another 16-year-old was making his way home to Lewisham.
A man assaulted him on the 2230 BST Rochester to Blackheath service, hitting him repeatedly.
The following day, on the 0700 BST Gravesend to Strood train, a man, along with several others, targeted a 27-year-old from Gravesend as he made his way to work.
Shortly before the train arrived at Strood, the gang grabbed the victim's rucksack and knocked him to the floor before kicking and punching him.
Punched on head
The final robbery happened on 8 September on the 1150 BST service from Higham to Gravesend.
A 24-year-old man from Chatham was approached by a man and told to hand over his mobile phone before being punched on the side of the head.
BTP have appealed to information about any of the men involved in the robberies.
"These were deeply shocking and distressing incidents," said Det Con Marie Jeffery.
"These incidents have become increasingly violent and we are determined to catch whoever is responsible."
The main suspect is described as as black, aged 20 to 25, 5ft 7in tall and of stocky build with a shaved head.