An advert appeared with a video featuring the Moscow17 collective, whose member Incognito was stabbed to death in south London on Wednesday.
Mars said it was "unacceptable" for its adverts to appear next to such videos and that it would be working with Google to "understand what went wrong".


Two other males, aged 16 and 31, who also suffered stab injuries in the Camberwell incident, have been arrested on suspicion of murder.


Moscow17 are part of the drill music scene and their videos get hundreds of thousands of views.


Their tracks include lyrics that taunt rival group Zone 2, from Peckham.


A Mars spokeswoman said: "It is unacceptable and disappointing to see one of our brands advertised alongside this video content.


"This clearly breaches our brand safety guidelines and Mars adverts should never run alongside such content.





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