Police investigating a robbery on the top deck of the 93 bus have released CCTV pictures of four men they want to speak to.
A gang stole personal items from two 17-year-olds, threatening to stab them, as the bus travelled from North Cheam to Morden.
The attackers, three white men and an Asian man with a Staffordshire bull terrier, got off just after the Peugeot garage on Morden Road.
Merton police have now appealed for help in identifying the four men, who may have witnessed the robbery at about 6.15pm on April 9.
They also want to speak to the four about a knifepoint robbery on a train travelling between Byfleet and Wimbledon at about 11.45pm on May 18.
Anyone with any information is asked to asked call PC Sylvester McNally at Wimbledon police station on 020 8649 3139 or Crimestoppers, anonymously, on 0800 555 111.
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