Those arrested - whose ages range from 18 to 24-years-old - remain in police custody and will be questioned today.
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The rodent was spotted at the Stephenson Place branch near New Street in Birmingham on Friday.
On the day the first tram arrives at Birmingham New Street, the director of Centro talks about the benefits of the transport system.
52-year-old David Cooley died on Thursday after sustaining serious head injuries during an altercation outside a pub in Leicester.