Potassium nitrate , other chemicals , intended to be used in small quantities . Potassium is used in gunpowder but also has many legitimate uses . No major laws , or terror - related activities , police ##d . Late Thursday night , several residential blocks were cordoned off and a few dozen homes were evacuated in Staten Island as police searched Serrano 's home and a nearby commercial storage facility . All round his Staten Island home was sealed off .
Potassium nitrate , other chemicals , intended to be used in small quantities . Potassium is used in gunpowder but also has many legitimate uses . No major laws , or terror - related activities , police ##d . All round his Staten Island home was sealed off .