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Ipswich, UNITED KINGDOM: (FILES) A female prostitute known as 'Lou' is pictured on the streets of Ipswich, in Suffolk, in eastern England, 11 December 2006. Police were deploying 'reassurance patrols' Tuesday to calm concerns of prostitutes and others in an English town gripped by a serial killer scare, as the death toll rose to five. Alastair McWhirter, the chief constable or head of Suffolk Police, cautioned Christmas party revellers not to get too drunk in the port town of Ipswich and urged prostitutes to stay in. AFP PHOTO/CARL DE SOUZA (Photo credit should read CARL DE SOUZA/AFP/Getty Images)

Ipswich, UNITED KINGDOM:  (FILES) A female prostitute known as 'Lou' is pictured on the streets of Ipswich, in Suffolk, in eastern England, 11 December 2006. Police were deploying 'reassurance patrols' Tuesday to calm concerns of prostitutes and others in an English town gripped by a serial killer scare, as the death toll rose to five. Alastair McWhirter, the chief constable or head of Suffolk Police, cautioned Christmas party revellers not to get too drunk in the port town of Ipswich and urged prostitutes to stay in. AFP PHOTO/CARL DE SOUZA  (Photo credit should read CARL DE SOUZA/AFP/Getty Images)