Police have released CCTV footage of a man who was left unable to eat for three months after being punched in the jaw.
It happened outside a fast food shop in Selly Oak in February last year. Police are appealing for witnesses.
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A large tent has been put up around the area while investigations continue.
The kind gesture touched the hearts of many who shared and retweeted words of support for the officer on Twitter.
Two workers were forced into a back office as the robbers tried to force their way into a safe, police say.