The rookie NYPD officer from Long Island who was critically injured in a hatchet attack that police have called a "terrorist attack," remained hospitalized Sunday in critical but stable condition, officials said.

NYPD Officer Kenneth Healey, 25, of Oceanside, was hit in the head with the hatchet on Thursday afternoon, when Zale Thompson, 32, charged at Healey and three other officers on foot patrol in Jamaica, Queens. Healey, who is being treated at Jamaica Hospital, is the son of a veteran Nassau County police detective in the First Squad.

Officer Joseph Meeker, 24, of Oakdale, was struck in the right arm with the hatchet, and was treated and released from the hospital. Two other officers with Healey and Meeker fired on Thompson, killing him. The officers also accidentally shot a 29-year-old female bystander in the back. Her condition Sunday was not released.

Police have said Thompson had extreme anti-government views and had converted to Islam two years ago and "self-radicalized."