New York terror attack suspect Sayfullo Habibullaevic Saipov “did this in the name of ISIS,” said John Miller, NYPD deputy commissioner for intelligence and counter-terrorism.

Saipov had been planning the attack for a “number of weeks,” Miller said, and appeared to have followed instructions ISIS has put out on how to carry out such attacks.

He said a handwritten note in Arabic found near the scene had both symbols and words, but the gist was that the Islamic State would endure forever.