Two NYPD sources said the police activity is tied to the investigation into two devices thrown during dueling protests outside Gracie Mansion on Saturday.
Police investigating after device thrown at anti-Islam protest in New York City The GuardianSmoking Jars of Metal and Fuses Thrown at Protest Near Mayor's House The New York TimesDevice ignited at Gracie Mansion protest was a improvised explosive, NYPD says NBC NewsDramatic video shows NYPD tackling man who threw ‘ignited device' near NYC mayor's home during protest clash Fox News
