More details are emerging about Sayfullo Saipov, the 29-year-old suspect in Tuesday's ramming attack in Manhattan.

According to The New York Times, investigators discovered handwritten notes in Arabic near the truck used by Saipov that indicated allegiance to the Islamic State (ISIS) jihadist organization.

At the same time, the newspaper said, investigators had not uncovered evidence of any direct or enabling ties between Saipov and ISIS and were treating the episode as a case of an “inspired” attacker.