New York’s Finest were left reeling Sunday after twin tragedies left two cops dead in the Bronx and another clinging to his life in Brooklyn.

In the Bronx accident, Kim Hoyoung, 32, and Edwin Paulino, 25, who worked in Harlem’s 32nd Precinct, were off-duty and reportedly returning from a party when the car they were riding in smashed into a Bronx River Parkway guard rail Sunday about 6:30 a.m. They were pronounced dead at the scene.

“Driver inattentiveness” may be a cause, according to published reports yesterday.

Four women, all in their 20s, were ejected from the car, a Nissan Altima that was mangled in the wreck. They were in serious but stable condition at Jacobi Medical Center late Sunday, and police said they were expected to survive.

Mayor Michael Bloomberg called the collision a “tragic accident.”

“To come on a day where you saw a police officer get hit by a motorcycle while he was chasing somebody,” Bloomberg said Sunday. “This just makes it so much worse.”

Just five hours before the Bronx crash, an officer was struck by a motorcycle as he chased suspected car thieves in Brooklyn.

Carlos Olmedo, 31, was in grave condition at Lutheran Medical Center and underwent surgery Sunday to reduce pressure on his brain, Bloomberg said. NYPD officials said Olmedo is expected to survive.

“This tragic accident just underscores the dangers that police officers face on a routine basis,” said Pat Lynch, president of the Patrolmen’s Benevolent Association.

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Olmedo, who has been with the force for more than three years, most recently with Bensonhurst’s 62nd Precinct, had been chasing three suspects on foot in that neighborhood when he was struck.

“Because of Officer Olmedo’s selfless service, thousands of people in Bensonhurst and across South Brooklyn never became victims,” Bloomberg said of the married father of three.

The motorcyclist, hospitalized in stable condition, was sober, Bloomberg said, and police said he was not charged.

But the investigation continued Sunday in the unrelated Bronx crash.

Nothing has led police to believe drugs or alcohol were involved, a police spokesman told amNewYork on Sunday.

Crash survivor Melina Ramirez, 26, however, told her sister the off-duty cops had been drinking, but not drunk, according to the Daily News.

The PBA did not yet have comment on the Bronx crash, citing the ongoing probe.

emily.ngo@am-ny.com