Police are searching for a 13-year-old boy who's been missing from his home in Edgbaston in Birmingham since Saturday night.
Munasar Jiniqow sneaked out of his parents' house in Sandon Road after they told him he couldn't go to an event at the Library of Birmingham.
Munasar failed to return home and was later reported as missing to police. His concerned family have not heard from him since.
Anyone who may have seen Munasar is asked to contact West Midlands Police on the 101 number.
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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.