An 18-year-old man has been arrested on suspicion of murdering Leonne Weeks, 16, who was found dead on a path in Rotherham.
Met Terror Operation
Met police are launching an anti-terrorist operation to raise awareness of the threats faced by London.
Scotland Yard is putting high visibility patrols in place around crowded places such as shopping centres and transport hubs until January 24.
Codenamed Operation Penna, it is the second scheme of its kind and sees specialist officers brief members of the public, businesses and local police to improve protection from terrorist attacks.
Commander Richard Morris, from Specialist Operations, said: "Everyone has a role to play in keeping London safe from terrorism.
"This operation sees specialist officers working closely with neighbourhood officers and communities raising awareness of security in London.
"We want to build on our engagement with communities and businesses in a variety of ways to counter the threat from terrorism. Our aim is to raise awareness and improve protection from a terrorist attack and other crimes.
"The threat to London from terrorism remains real and serious so we encourage the public to remain vigilant and alert and to report anything suspicious to police."
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