The man suspected of stabbing renowned author Salman Rushdie in western New York pleaded not guilty Saturday to attempted murder in the second degree and other charges, his attorney says, CNN reported.

Hadi Matar, 24, is accused of stabbing Rushdie -- whose controversial work has triggered death threats -- at a speaking engagement on Friday, authorities said. 

Matar, a New Jersey resident, also was charged with assault in the second degree, with intent to cause physical injury with a deadly weapon. Matar pleaded not guilty, according to Nathaniel Barone, his public defender. The attorney said Matar has been "very cooperative" and communicating openly, but he did not discuss the content of those conversations.

He was refused bail and remanded to the Chautauqua County Jail. Matar's next court appearance is Friday.

Rushdie, 75, was stabbed on stage at the Chautauqua Institution before he was slated to give a lecture, New York state police said Friday. He was airlifted to a hospital in northwestern Pennsylvania and underwent surgery, a Pennsylvania police official said. The hospital said it had no update to provide on his condition Saturday.

Rushdie's injuries included three stab wounds to the right side of the front of his neck, four stab wounds to his stomach, a puncture wound to his right eye, a puncture wound to his chest, and a laceration on his right thigh, according to Chautauqua County District Attorney Jason Schmidt, who provided details of the injuries during Matar's arraignment.

Rushdie may lose his right eye, the county prosecutor added, according to CNN.

On Friday, Rushdie was put on a ventilator and was unable to speak, his agent, Andrew Wylie, told The New York Times. "The nerves in his arm were severed; and his liver was stabbed and damaged," Wylie said. "The news is not good."

The FBI is working with local and international authorities in its investigation into the attack, including "international partners in the United Kingdom to provide additional resources, since the victim is a UK-US dual citizen," a spokesperson told CNN on Saturday.