An intense manhunt for the remaining suspect in the shooting on Monday of two New York City police officers was under way yesterday in Pennsylvania, Police Commissioner Raymond Kelly said.

The second of three suspects in the shootings, Dexter Bostic, 34, was arrested at about 6.p.m. after a police chase that took place just off Interstate 80 in the Pocono region of Pennsylvania, Mr. Kelly said.

The other suspect, Robert Ellis, 34, was with Bostic but was able to escape into nearby woods, Mr. Kelly said.

“The second suspect, Robert Ellis, is the subject of an intense manhunt currently under way near Tannersville, Pa.,” Mr. Kelly said at a press conference last night.

The suspects were wanted in connection with the shooting of officers Russel Timoshenko and Herman Yan early Monday after they were pulled over in a stolen vehicle in the Prospect Lefferts Garden section of Brooklyn, police said. Officer Timoshenko has been in grave condition at Kings County Hospital since the shooting. Officer Yan sustained a gunshot wound to the arm. A bulletproof vest blocked a round headed for his chest. He was released from the hospital Tuesday.

Investigators searched for Ellis until nightfall, Mr. Kelly said. A perimeter was set up around the area, and police will continue the search today, Mr. Kelly said.

‘I’m fairly confident we’ll find the other one shortly,” Mr. Kelly said.

City detectives were tipped to the whereabouts of the two suspects yesterday afternoon after discovering the identity of a man who assisted the suspects in their escape by driving them to Pennsylvania, he said.

Investigators tracked Bostic and Ellis from Queens through four states on their way to Pennsylvania, Mr. Kelly said.

The accomplice dropped off Bostic and Ellis about 14 miles from where Bostic was arrested, he said.

The suspects first fled into Long Island, and then took a ferry across the Sound to Bridgeport, Conn. They later stopped at a supermarket in Tarrytown, N.Y., where they purchased tuna fish, crackers, peanut butter, and water, Mr. Kelly said. Remnants of the same food were found in a forest where investigators had tracked the suspects throughout the day yesterday, he said.

Local law enforcement in the Pocono region were informed by city police that Bostic and Ellis were in the area at about 10 p.m. on Tuesday, local police officials said.

Bostic is being held at the Swiftwater state police station in East Straussberg, Pa., where he awaits extradition, Mr. Kelly said.
The Pennsylvania manhunt was made up of more than 50 law enforcement agents from the New York City Police Department, the U.S. Marshals Service, and state and local Pennsylvania police.

Bostic, who also goes by the alias Marcus Williams, is suspected to have been sitting in the passenger side of a stolen sport-utility vehicle when he shot Officer Timoshenko twice in the face and neck at 2:30 a.m. on Monday, police sources said.

It is believed that Ellis shot five bullets at Officer Yan from the backseat of the vehicle, which was stolen from a car dealership in Inwood, Long Island, where he worked as a salesman with Bostic, police sources said.

As the dragnet focused in on Pennsylvania yesterday, the family of Officer Timoshenko and more than 100 uniformed police officers, many of whom worked with the fallen officer at the 71st precinct in Brooklyn, watched as a third suspect in the shooting, Lee Woods, was arraigned and ordered held without bail at Brooklyn Criminal Court.

The criminal complaint named Woods as the driver of the stolen sport-utility vehicle from which two other suspects shot officers Timoshenko and Yan.

Woods, who was convicted of a shooting as a juvenile, was charged with attempted murder in the first degree, aggravated assault of a police officer, criminal possession of a weapon, and three lesser charges.

The prosecutor, Deputy Chief Ann-Sigga Nicolazzi of the Brooklyn district attorney’s homicide bureau, told Judge Richard Allman that the crime was “nothing short of an attempted execution.” She also said that Officer Timoshenko is paralyzed from the neck down and is unable to breathe on his own.

Woods’s attorney, Patrick Megaro, said his client was a victim of circumstance, arguing that he did not pull the trigger on either of the two guns used to shoot officers Timoshenko and Yan.

“There is nothing here to suggest that he shared the intent to harm these police officers,” Mr. Megaro said.