NEW YORK, April 18 (Reuters Legal) - Police in Nassau County, New York, slammed a 90-year-old man to the floor, pushed his face across the carpet and arrested him without cause last year, his son said in a lawsuit on Friday.

Nicholas Sciortino sued for assault and battery, unlawful use of excessive force and the infliction of emotional distress on his father, who has since died, and claimed $100 million in damages.

Nassau County Attorney John Ciampoli said the county had not yet been served with a copy of the complaint but would mount a vigorous defense.

Officers Salvatore Curcio and Frank Pelo were responding to a call at the Harbor House/Oyster Bay Manor Assisted Living facility in January, 2010, when the incident took place, according to the complaint.

Employees at the facility in Oyster Bay, New York, had found Michael Sciortino, who suffered from dementia, with a bleeding cut on his wrist. When he refused to let them bandage the injury, the employees called the police, the suit said.

Immediately on entering Sciortino's room, one of the officers struck Sciortino in the face with three towels, and an officer slammed Sciortino's face into his mattress repeatedly.

"After he was handcuffed, defendants Curcio and Pelo slammed Mr. Sciortino (to) the floor," it said. They then pushed his face "across the floor causing rug burns to his face." While he was on the floor, the officers beat him until his nose bled, it said.

The lawsuit seeks $80 million in compensatory damages and $20 million in punitive damages along with attorney's fees and injunctive relief.

The case is Sciortino v. County of Nassau, U.S. District Court, Eastern District of New York, No. 11-cv-1884.

For Sciortino: Frederick Brewington of the Law Offices of Frederick K. Brewington.

For the defendants: Not immediately available.

(Reporting by Terry Baynes of Reuters Legal)