The Bronx

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A drug trafficking ring was smashed with the roundup of 27 thugs up for dealing crack cocaine in Laconia, authorities said.

The crew allegedly sold drugs at the Parkside Houses on White Plains Road and at the Allerton Avenue co-ops on Bronx Park East.

Undercover police since 2006 made more than 150 drug buys from the ring, authorities said.

Alleged ringleader Yackeem McFarlane, 22, and cohorts Elvin Skelton, 24, and Bernard Miles, 24, were among those taken into custody.

Authorities are still seeking seven other suspects.

“As we saw this week with the murder of Police Officer Peter Figoski, illegal drugs fuel violence that all too often ends in tragedy,” said NYPD Commissioner Ray Kelly.

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Armed thugs threatened two women at knifepoint in separate incidents Sunday at the West 231st Street elevated train station in Kingsbridge, cops said.

In the first, two teenagers walked up to an 18-year-old woman riding a northbound No. 1 train at 2:45 p.m., threatened her with a knife and demanded her Blackberry. The woman handed it over and the robbers fled.

A few hours later, a knife-wielding third teen threatened a 42-year-old woman exiting the No. 1 train and tried to take her iPhone, but she fought him off and he fled empty-handed.

Queens

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A Flushing man is lucky to be alive after a deranged acquaintance plunged a knife into his head and the victim jumped two stories to escape the maniac, police authorities said.

Dongkui Yin, 35, of Brooklyn, followed the victim into a second-floor apartment at 36-41 Union St. at around 10 p.m. on Nov. 30, court papers state.

He then allegedly pulled a blade and stabbed the victim in the head.

The terrified victim leaped from a window to flee his attacker and lost consciousness from a profuse loss of blood, cops said.

The victim was taken to a local hospital and is recovering in the Intensive Care Unit.

Yin was arrested the next day.

It’s unclear what sparked the bloodshed.

Manhattan

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Two thieves robbed a man at gunpoint yesterday in Washington Heights, cops said.

The armed thugs jumped the 22-year-old victim in his building on West 179th Street near Broadway at 1:39 p.m. and fled after snatching cash and an ID, cops added.

The victim was not injured.

Police were searching for the duo, who may have hopped on a bus at the George Washington Bridge Bus Station.

***

A career burglar swiped a briefcase from a Midtown building, authorities said.

Roger Porcelli, 43, sneaked into the high-rise on East 52nd Street near Lexington Avenue at 1:26 p.m. on Dec. 6, court records reveal.

He allegedly ventured up to the sixth floor and snatched a package containing the briefcase as it sat unattended in the hallway.

Porcelli was picked up last Friday, cops said.

He has done five stints behind bars on burglary and attempted-burglary convictions, records show.

***

Finders may be keepers, but not with the IRS or its checks.

A Harlem man was caught with an IRS check for $6,612 when cops busted him for carrying 100 pain pills and ecstasy, authorities said.

Luis Medrano-Rosario, 25, told cops he “found the check on the street” and “the pills are just to get high” when he was cuffed at West 148th Street and Broadway at around 10:55 p.m. on Dec. 5, according to court documents.

He was charged with drug possession and possession of stolen property.

***

Fire marshals tracked down an arsonist who torched his room in a single-room-occupancy facility in Hell’s Kitchen, authorities said.

Ladu Privott, 21, was caught on camera leaving the pay-by-the-week building at 136 W. 44th St. shortly after setting fire to his mattress at around 11:45 a.m. on Oct. 25, court records show.

The building’s residents were evacuated and Privott was arrested on Dec. 2.

***

A crooked employee stole 12 checks worth more than $3,000 from the Midtown firm where he worked, authorities said.

Kenneth McNair, 27, began the scam shortly after he was hired in July 2010 at Rapid Realty on 38th Street near 10th Avenue, court papers state.

He would deposit the money in either his bank account or a friend’s account, cops said.

The scheme was recently uncovered and McNair was arrested last Friday.

He allegedly admitted to stealing the money.

***

A sticky-fingered thief was busted after he returned to a Lower East Side bar days after swiping more than $2,000 worth of property from a patron, authorities said.

Jimmy Perez, 49, snatched a bag containing a $700 laptop, a $299 Gucci wallet, a $400 jacket, a $600 cellphone, $400 in cash and other pricey electronics from a table in the Ludlow Bar on Ludlow Street on Dec. 2 before getting bounced for an unrelated incident at 3 a.m., court papers state.

The caper was caught on camera and police nabbed Perez on Dec. 6 when he returned to the bar and an eagle-eyed manager recognized him and called cops, the documents add.