Birmingham's A38 tunnels reopened shortly after 3am this morning after six weeks of work to improve them.
Overnight closures from 10pm to 6am will remain in place for the St Chad’s and Queensway tunnels for the remainder of the month while tests are carried out on the work completed.
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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.