The terror network told fanatics to "terrorise October 31", alongside a harrowing image of a bloodied machete edited on top of the Eiffel Tower. It's unclear, however, if that is the investigation with which Saipov was involved.
After striking pedestrians and bicyclists on the riverfront path, the truck crashed into a school bus.
The foreign minister also said that three Belgians were among those injured in the attack.
The suspect was shot by police, but survived and was taken to a hospital.
Police shot Saipov, 29, in the stomach at the end of the rampage, but he was expected to survive. "And it was shortly after 3 [p.m.]".
One of those who died was a Belgian woman, while the identities of the other two dead have not yet been released.
The attack occurred a few blocks from the new World Trade Center building at the site of the 9/11 terrorist attack in 2001.
The Philippine Consulate General in New York immediately issued an advisory for members of the Filipino Community to stay away from the scene of the incident at Chamber and West Streets in lower Manhattan.
The assailant has been identified as Sayfullo Saipov, 29, a truck driver who had lived in Tampa, Florida and was recently living in Paterson, New Jersey.
Suspect Sayfullo Saipov seen in this undated photo.
Saipov once listed his occupation as a truck driver, his marriage license shows.
According to investigators, Saipov rented the pickup truck that he then drove into a crowded bike path. The NYPD added extra officers, heavy weapons teams and sand trucks as protective blockers along the parade route, and officials emphasized that New Yorkers should feel safe. Earlier, law enforcement sources told local media that the incident is being investigated as a terrorist attack.
The vile messages of joy circulated between extremists on Telegram come hours after the terror cell called on supporters to launch Halloween attacks. "I will continue to follow developments closely", the president said.
Six men were declared dead at the scene, with two people pronounced dead at hospital. "He was really calm", another told the Enquirer.
Police say the suspect acted alone.
Uzbekistan's President Shavkat Mirziyoyev said his government would do all it could to help investigate the "extremely brutal" attack.
"It was simply a matter of being in the wrong place at the wrong time", Mountain said.
Trump later wrote that "we must not allow ISIS [Daesh] to... enter our country after defeating them in the Middle East". Saipov came from Uzbekistan, where there is an extremist organization called the IMU, the Islamic Movement of Uzbekistan, Townsend reports. Uber is now in contact with FBI about the incident and has banned the suspect from the Uber app.
He described Saipov as unfriendly, adding that he "never says good morning and never says good afternoon", NJ.com reported.