Police investigating the deaths of two Big Issue sellers in Birmingham said victims Wayne Lee Busst, 32, and Ian Watson Gladwish, 31, may have known their attacker.
We have had a fantastic response from the public so far and their information has proved vital to our investigation.
Early enquiries suggest that this wasn't random. The attacker appears to have known his victims.
Detective Inspector Rogers appealed for anyone who witnessed the stabbings on Friday evening to contact police on 101.
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