Security tightened at British sites across New York after London attack

New York police ramped up security at British sites across the city on Wednesday after an assailant fatally stabbed a policeman outside Britain's parliament and was then shot and killed by police.Heavily armed officers and explosives-detecting dogs were deployed to locations including the British Consulate and the British Mission to the United Nations in Manhattan, senior New York Police Department officials told a news conference."You'll see a larger presence of the dogs at these locations, as