Brooklyn

Park Slope’s top cop swung into action yesterday and nabbed four teen robbery suspects.

Deputy Inspector John Argenziano was on patrol at 6 p.m. when he spotted four teens walking along Seventh Avenue near Ninth Street.

He noticed one of them matched the description of one of four teens wanted for stealing a BlackBerry on Fifth Avenue two hours earlier, police sources said.

Argenziano and his men stopped the youths, and the victim identified them at the scene, said the sources.

The suspects, who range in age from 16 to 19, were arrested on robbery charges. One of them had the phone in his pocket, cops said.

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A young man was shot dead in Flatbush.

Marlon Hinds, 20, was gunned down at 9:40 p.m. Monday in front of his apartment building at 5501 Snyder Ave.

A woman with him was uninjured.

Hinds had a lengthy criminal record, including holding up a woman at gunpoint in October 2009 and forcing her to withdraw $12,000 from ATMs, sources said.

Several months later, he called the woman in an attempt to frighten her from testifying, the sources added.

Most recently, last month, he was collared for pot possession.

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A Bensonhurst teen viciously attacked a classmate with a glass bottle amid an ongoing beef over a comb, authorities said.

Jamal Mcilwain, 17, set upon Paulo Vaivao, 17, at 1:30 p.m. on Jan. 14 outside a deli on 79th Street near 16th Avenue, cops said.

Mcilwain allegedly punched Vaivao in the head and smashed him in the face with the bottle.

Vaivao was rushed to Lutheran Hospital, where he required more than 100 stitches to close facial lacerations.

Mcilwain fled, but the NYPD Warrant Squad tracked him down Monday.

Queens

A Long Island City woman was arrested yesterday for allegedly killing her sister and injuring the sister’s boyfriend.

Melanie Webb, 24, was charged with murder, attempted murder, weapons possession and assault.

Tara Webb, 27, was shot dead after celebrating her birthday in her apartment in the Queensbridge Houses.

Terrell Carmichael, 26, was struck but survived.

Deshawn Casey, a friend of the sisters, does not believe Tara was the intended target.

“She wanted [Carmichael] out of the house and he started laughing at her, so she went and handled her business and Tara got caught in the crossfire,” Casey said.

Manhattan

A disturbed man was busted for calling in a bogus bomb threat, authorities said.

“A bomb is going to blow up in Penn Station in 45 minutes,” Luis Gonzalez, 42, allegedly told a 911 operator at 5:15 p.m. Sunday from a pay phone at Eighth Avenue and 30th Street.

No explosive device was found and cops traced the call back to Gonzalez, police said.

“I called the bomb threat but didn’t mean to do it,” Gonzalez admitted, according to court papers.

He was arrested and charged with falsely reporting an incident.

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An employee with the city’s Human Resources Administration was arrested for inappropriately touching a teen girl and e-mailing her sexually explicit photos of himself, authorities said.

Between July 2010 and March 11, Brian St. Just, 35, of The Bronx, allegedly carried on an inappropriate relationship with the victim, who was an acquaintance and not a client.

The city Department of Investigation launched a probe last week after receiving a tip that St. Just had compromising photos of the girl on his cellphone, authorities said.

St. Just, who began working for the welfare agency in April 1996 and was assigned to the agency’s Business Links program on West 34th Street in Midtown, was arrested Monday and suspended without pay.

Staten Island

A jilted boyfriend who tried to burn down the door of his pregnant ex-girlfriend’s Park Hill apartment was caught standing naked in the hallway, authorities said.

Rasheen Harrison, 24, was peeved that his former flame had allegedly stolen his cellphone, so at 5:26 a.m. Sunday, he stripped off his clothes and set fire to them in front of the door to her apartment on Vanderbilt Avenue, trapping the woman, her two young children and two others inside, cops said.

“I’m going to burn your house and this whole building down with you in it,” he allegedly snarled.

Cops arrested Harrison and charged him with arson and reckless endangerment, said a spokesman for DA Dan Donovan.