Detectives have named a missing 19-year-old woman - who police fear has been murdered - as Amelia Arnold.
Police and scene-of-crime specialists are examining a property in Hadrian's Walk in Stevenage.
Witnesses who may have seen suspicious activity at the address between Wednesday and Friday are also being asked to come forward.
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.