On the first warm day of spring, emergency agencies were taxed by a series of incidents throughout the city yesterday that sent 10 firefighters and a police officer to the hospital, and brought parts of uptown Manhattan to a standstill.

A police officer was shot in the leg, a three-alarm fire blocks from Lincoln Center left a woman clinging to her life, a five-story building collapsed in Harlem, and the United Nations had a bomb scare.

“I’ve been doing this for 27 years and this is one of the wildest days ever,” a taxi driver, Jose Nunez, said.

The police officer was shot last night while arresting a known gang member in the Park Slope section of Brooklyn, Commissioner Kelly said.

As the officer, Rory Mangra, 27, attempted to arrest Kinsley Newland at about 7 p.m. on the corner of Dean Street and Flatbush Avenue, the male suspect pulled a gun, and shot the officer in the right leg, shattering his fibula, Commissioner Kelly said at a press conference.

Mr. Mangra had chased Newland after spotting him smoking what appeared to be a joint of marijuana, Mr. Kelly said.

Kinsley, who attempted to apologize to the officer after the shooting, has seven previous arrests, Mr. Kelly said.

“Our officers keep encountering suspects who would rather fight than be put in custody,” Mr. Kelly said.

Earlier in the day, firefighters responded to a 911 call reporting a fire on 65th Street between Broadway and Central Park West.

Most of the tenants had fled by the time firefighters arrived at about 8 a.m., except for a man and a woman who were trapped on the third floor by the spreading fire, Assistant Chief Michael Weinlein said.

When firefighters reached them, the woman was in cardiac arrest, likely from smoke inhalation, fire officials said. She was rescued via a fire escape in the front of the building, and resuscitated by Emergency Medical Service technicians, fire officials said.

“Basically she died and we brought her back to life,” Chief Weinlein said. Both victims were taken to Roosevelt Hospital, where they were in stable condition, fire officials said.

Firefighter Timothy Garrett, who was on the fire escape during the rescue, sustained burns to his neck and face, fire officials said. Nine other firefighters had minor injuries.

An overheated clothes dryer in the basement ignited the blaze, which took about two hours to contain, a fire official said.

A few hours later, at about 11:30 a.m., a five-story building in Harlem collapsed, shutting down subway service on the east side of Manhattan.

“You heard a few bricks fall onto the scaffolding, and then the whole block got filled with smoke,” a witness, Omar Guzman, said.

Twelve construction workers doing renovations were on a scaffold outside of the vacant building at 1861 Lexington Ave. when it collapsed, city officials said. Only one was hurt. He was taken to Harlem Hospital with an arm injury, fire officials said.

Five other nearby buildings were ordered vacated by the department of buildings as a precautionary measure, Ms. Lindquist, said.

The Red Cross set up a reception center at the James Weldon Johnson School at 115th Street and Third Avenue where members of an estimated 30 households could sign up for assistance, a spokesman for the American Red Cross in Greater New York, Michael Virgintino, said.

Subway service on the Lexington Avenue line was initially suspended or rerouted for several hours in Manhattan because of fears about running trains underneath the potentially unstable structure, a spokesman for New York City Transit, James Anyansi, said. By nightfall, service was mostly restored.

While it appears that the renovation work may have compromised the structural integrity of the building, the department of buildings is still investigating the cause of the collapse, Ms. Lindquist said.

Earlier yesterday morning the United Nations was stirred by a bomb threat.

“The NYPD informed us during the morning hours of an unconfirmed bomb threat,” a U.N. spokesman, Frahan Haq, said. Police received a 911 call about a potential bomb at about 9 a.m., Deputy Police Commissioner Paul Browne, said. The department is investigating the threat, he said.