BROOKLYN

* Three teens assaulted a fourth in their Fort Greene group home, authorities said yesterday.

The violence began at 4:55 a.m. Tuesday, when suspect Moses Llanos, 19, argued with his 18-year-old victim in the group home on Clinton Avenue, sources said.

The dispute quickly escalated, and Eric Cooper, 19, and Daniel Gruzzo, 18, joined in, the sources said.

Cooper allegedly picked up a chair, hurled it and hit the victim.

Gruzzo threw another chair at the victim, sources say.

All three suspects allegedly kicked and punched the victim.

Sources said Llanos then repeatedly whacked the victim in the face with a metal pole.

A witness called 911, and police arrested Llanos, Cooper and Gruzzo.

The victim did not suffer life-threatening injuries.

* A Macy’s employee attacked his manager after receiving a dismissal letter in the mail, authorities said yesterday.

Marvin Chisholm, 24, had been suspended from his job at the Macy’s store in Kings Plaza Mall in Flatlands, sources said.

It was not immediately clear why he was suspended, but recently he received a letter stating he was fired.

Chisholm went to the store, confronted his manager and hit him in the face, the sources said. Police were summoned and arrested Chisholm.

The manager suffered cuts and scratches.

* A man impersonating a cigarette-tax inspector was arrested after stealing cash from two stores after trying to swipe money from a third, authorities said yesterday.

The first incident occurred at 7 a.m. Tuesday, when Joseph Rios, 52, walked into Estela Grocery on Church Avenue, flashed some sort of ID and told a worker he was a cigarette inspector, sources said.

Rios allegedly asked to go behind the counter, but the worker refused to let him, so the suspect fled.

Rios struck next at a nearby store, A&B Deli, and repeated the ruse, sources said.

He told a worker he had to check the cigarettes while strolling around the store. Finally, he swiped cash on the counter and left.

The worker noticed the money was gone, followed Rios outside and flagged down a cop.

The worker and the officer saw Rios enter a nearby supermarket.

They went in and caught him with stolen cash, sources said. The cop put the suspect under arrest.

QUEENS

* Cops are hunting for a motorist who plowed into a narcotics-cop car in Woodhaven, prompting one officer to fire a shot at the man behind the wheel.

The bizarre incident unfolded at 79th Street and 91st Avenue at 9:45 p.m. Tuesday, as a group of narcotics cops and a sergeant followed a woman suspected of being a drug dealer.

The narcotics cops had initially seen the woman entering a dark-colored Mazda driven by a man, sources said.

Suspecting a drug deal was taking place, the officers blocked the Mazda with their car, but the Mazda driver backed into the cops’ vehicle, prompting one of the officers to fire a shot.

The driver managed to speed off, sources said.

A check of area hospitals failed to produce evidence that he or his woman passenger had been shot or injured in their car.

None of the narcotics cops was seriously injured, sources said.

STATEN ISLAND

* A driver attacked several cops after he was caught with two handguns at a car stop in West Brighton, authorities said yesterday.

Donnell Collier, 22, was driving a 1998 gold Nissan Maxima on Henderson Avenue at 2 a.m. Tuesday when police noticed the car had no license plates and pulled him over, sources said.

When cops approached the vehicle, they found Collier in possession of .38- and .45-caliber weapons, sources said.

As four of the cops arrested Collier, he allegedly head-butted one of them and struggled with the others.

He was charged with assault and gun possession, said DA Daniel Donovan.