SKT Welfare the charity is making preparations to send its second convoy to Syria with 30 ambulances leaving the UK today.
Six ambulances are setting off from Birmingham and will start the 3000 mile trip this afternoon.
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He demanded the money after placing a carrier bag containing what appeared to be a heavy object on the counter.
Closures will be in place on the Aston Expressway, Park Circus and Salford Circus. There will be some full weekend closures and diversions.
West Midlands Police have said specially trained police negotiators are speaking with the woman to try and talk her down to safety.