BUCKS COUNTY, Pa. (WPVI) -- Six people were arrested Saturday in New York City following a dueling protest outside Gracie Mansion, and federal authorities have launched a terrorism investigation. Two of those arrested are from Bucks County, Pennsylvania, and remain in custody. On Sunday, FBI agents searched the homes of 19-year-old Ibrahim Kayumi in Newtown and 18-year-old Emir Balat in Langhorne. The searches came after the NYPD said at least one improvised explosive device was deployed during the protest, with additional devices now under investigation. "Nothing like this happens around here. So it's pretty scary," Newtown neighbor Pamela Pulsinelli said.