With world leaders arriving for UN General Assembly, NYPD on alert after blast

New York City Mayor Bill de Blasio said Sunday that residents of the city would see an expanded presence of police as officials investigate a bombing in Chelsea that injured 29, while guarding the United Nations General Assembly, which draws leaders from around the world to New York each year.“You will see a very substantial NYPD presence this week, bigger than ever,” de Blasio said during a press conference just after noon Sunday.De Blasio said all 29 victims of the explosion, which