Emergency personnel have responded after a package with suspicious white powder was delivered to the mail room for the New York City building housing the Manhattan District Attorney's office, according to police. A law enforcement source confirmed there was a note saying "Alvin – I’ll kill you" in the envelope. NY GRAND JURY NOT EXPECTED TO CONSIDER TRUMP CASE THURSDAY, SOURCE SAYSThe grand jury involved in the Trump case has been meeting in the building where the suspicious package was reported, but it does not sit on Fridays. The grand jury was scheduled to meet Wednesday to hear from at least one additional witness in the case, but proceedings were canceled. Two familiar sources told Fox News Digital on Wednesday that the grand jury was canceled amid "major dissension" within the district attorney's office.