A North Patchogue teenager faces arraignment on an indictment Wednesday in the attack on two police officers with a knife last week that sent one of the officers to the hospital, the Suffolk district attorney's office said.

The two officers were responding to a call June 15 about a man with a knife on Wilmarth Avenue in North Patchogue when they saw Liam Rooney, 18, on the street, prosecutors said.

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When they tried to question him, Rooney several times refused to take his hands from his pockets and suddenly pulled out a knife with a 4-inch blade from his jacket pocket, authorities said.

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He hit an officer in the head with the butt of the knife, then slashed at him, cutting his shirt sleeve, prosecutors said. The police officer was treated for a head contusion at Brookhaven Memorial Hospital.

Rooney, of Wilmarth Avenue, has been held in jail in lieu of a $105,000 cash bail on charges of arrest charges of assault, criminal possession of a weapon fourth degree, resisting arrest and two counts of menacing in the second degree.

His arraignment is scheduled for Thursday in Central Islip.