AUTHORITIES have not seen evidence that leads them to believe anyone else was involved in a deadly truck attack on a New York cycle path, a New York Police Department official says.

Deputy Commissioner John Miller said on CBS This Morning that Sayfullo Saipov is the only suspect but that could change.

Miller said Saipov was “following Isis instructions” to “yell it out” and spread the terrorist agenda. He said the group suggests leaving leaflets at the scene of terrorist acts.

The 29-year-old Uzbek immigrant has been charged with terrorism and other crimes. Eight people were killed in the attack on Tuesday near the World Trade Centre.

Saipov’s lawyer, David Patton, said he hopes “everyone lets the judicial process play out”.

The suspect has been charged with providing material support to a terrorist group and violence and destruction of motor vehicles.

Even as he lay wounded in hospital from police gunfire, Saipov asked to display the Islamic State group’s flag in his room and said “he felt good about what he had done,” prosecutors said in court papers.

He appeared in the New York federal courthouse in a wheelchair, handcuffed and with his feet shackled. He was ordered to be detained. His lawyers said they were not seeking bail and Saipov did not enter a plea. A judge set his next court date for November 15.