Manhattan

A burglar who climbed through a furnace to sneak inside an Upper West Side apartment building was arrested after committing a second robbery, authorities said yesterday.

On May 6, Ronald Alexander, 45, slipped through the furnace into the laundry room at a residential building at West 102nd Street and Broadway, sources said.

There he allegedly swiped a DVD player, drills and other items.

Then, last Saturday night, Alexander illegally entered an apartment on Central Park West near West 96th Street, cops said.

When the resident arrived home minutes later, Alexander jumped out the first-floor window and fled, detectives said.

The woman gave chase and alerted building security personnel, who flagged down police.

During the pursuit, Alexander allegedly dropped a jewelry box and scissors taken from the woman’s apartment.

He was caught and arrested, and detectives identified him as the suspect in the earlier robbery.

A man attacked a fellow street peddler with a chair and smashed the back windshield of a Lexus in Chinatown, authorities said yesterday.

Rafael Reyes, 46, got into an argument with another peddler who the suspect felt was hawking wares too close to Reyes’ location at Howard Street and Broadway at 4 p.m. Sunday.

Reyes allegedly grabbed a chair and attacked the victim with it. Then he allegedly tossed the chair into the back window of the Lexus.

A cop grabbed Reyes.

The victim required seven stitches and a tetanus shot.

A deranged bench-sitter beat a man who tried to sit next to him in a Lower East Side park, authorities said yesterday.

Carl Gainey, 44, clashed with the 46-year-old victim in FDR Park at 2:30 p.m. on July 1, cops said.

Gainey, who appeared intoxicated, allegedly shouted “this is my bench” and smashed the victim in the head with a cane. On Monday, the victim spotted Gainey and called police.

Brooklyn

A gang of about eight thugs beat a man in Washington Heights last night before running off, police sources said.

The victim, who was not immediately identified, suffered a head injury and was rushed to Columbia-Presbyterian Hospital.

A man fell into the East River from a party boat cruising off the South Sea Seaport and was rescued by the Coast Guard last night, sources said.

The man, who was not identified, was apparently intoxicated when he fell at about 9:05 p.m., authorities said. He was handcuffed, but it was not clear whether he was formally charged with a crime.

Police busted a drug suspect who slugged a man in Park Slope, authorities said yesterday.

An officer saw Matthew Hernandez, 17, running in the vicinity of Smith and Douglass streets at 1:45 a.m. Tuesday, sources said.

Hernandez told the cop someone had punched him in the face, but Hernandez had no visible injury.

Police nearby then spotted a 54-year-old man bleeding from an eye laceration that he suffered at the hands of Hernandez, cops said.

Hernandez was arrested and brought to the 76th Precinct station house, where police found 46 bags of crack cocaine stuffed inside his underwear, sources said.

A teenager was arrested for beating and robbing an acquaintance in Brighton Beach, authorities said yesterday.

Evgeniy Simonovsky, 17, accused the 18-year-old victim of swiping his drugs at Brighton Beach Avenue and Brighton 11th Street at 2 a.m. on July 7, cops said.

The victim denied the rip-off, but Simonovsky slugged him in the face and swiped two chains, a watch and a ring, cops said.

Simonovsky fled in a car, but was arrested Tuesday.

Queens

A body fitting the description of a Queens teen who went missing in rough surf off Rockaway Beach was found yesterday just miles from where she was last seen, police said.

Cops said clothes on the body matched those worn by Tiara Coaxum, 16, when she vanished in a huge swell on Friday afternoon as lifeguards rescued her friend from the water near Beach 116th Street.

Staten Island

Cops arrested an unlicensed driver for drug possession after they pulled him over for speeding in Bulls Head, authorities said yesterday.

Christopher Vega, 31, was stopped by police at Jardine Avenue near Leggett Place at 4:30 p.m. Tuesday.

Officers recovered a lit marijuana cigarette from the car’s ashtray along with a bag of pot and cocaine, said a spokesman for DA Daniel Donovan.

Two muggers were busted early yesterday after they swiped a man’s cellphone in West Brighton, cops said.

Duran Brewer, 18, and José Romero, 29, allegedly grabbed a man at Clove Road and Castleton Avenue just after midnight.

Brewer allegedly punched the victim in the face while Romero allegedly snatched the phone and smashed it on the ground. The alleged thug then demanded money, but the victim said he had no cash in his possession.

The crooks fled empty-handed, but cops quickly caught them nearby.