PROVIDENCE � The four young men and teenage boy accused in last week�s murder of an innocent 17-year-old boy were seeking revenge for a robbery, according to the police.

PROVIDENCE � The four young men and teenage boy accused in last week�s murder of an innocent 17-year-old boy were seeking revenge for a robbery, according to the police.

The plans for retaliation started on Facebook, where someone named �West Alan� made threats against the house at 145 Colfax St., according to an affidavit filed with an arrest warrant in District Court on Tuesday.

George Holland II, 17, happened to be visiting his girlfriend there on Feb. 4, the night the five allegedly decided to exact their revenge.

As the Providence police investigation found, once the young men decided to shoot someone at 145 Colfax St., it didn�t take long for them to get a sawed-off shotgun and be on their way.

One shot blasted through a kitchen window that night, hitting Holland in the abdomen. Emergency surgery at Rhode Island Hospital couldn�t save his life.

That same night, miles away in Woonsocket, the man accused of firing the fatal shot and the man who allegedly gave him the gun �hugged and celebrated the shooting,� according to witnesses quoted in the affidavit.

Maj. David Lapatin declined comment Tuesday on the investigation. The police have said that Holland, a student at High Road School and an offensive lineman on Central High�s football team, wasn�t the intended target.

Early on, detectives uncovered the social-media identity of �West Alan,� who is an 18-year-old Pawtucket man named Alain Bedame, the affidavit said.

That led detectives to other suspects: a loose group of friends, acquaintances, former junior high classmates and one who allegedly leads a street gang called �SMG,� according to the affidavit. All were arrested within days of Holland�s murder. Lapatin said the police aren�t seeking any other suspects.

Bedame, of 280 Weeden St.; Seydina Limamou Ndoye, 19, of 20 Columbus St., Providence; and Ashner �Pookie� Alexis, 18, of 224 Pearl St., Providence, are held on charges of murder and conspiracy. Anthony Moore, 21, of 107 Rathbun St., third floor, Woonsocket, is charged with conspiracy. More charges are expected. All were ordered held without bail and, if convicted, could face life in prison.

A juvenile is being held at the Rhode Island Training School and will be presented in Family Court on Friday. If he is waived out of Family Court and tried as an adult, he could also face life in prison.

The investigation by Sgt. William Dwyer Jr. and detectives Daniel O�Connell and Kenneth Court found a deadly plot that came together rapidly on Feb. 4.

Bedame and Ndoye picked up Alexis, who directed them to Woonsocket, the affidavit said. That�s where they met with Moore, the supposed leader of SMG, and discussed a plan to shoot someone at 145 Colfax St., the affidavit said. Moore got the sawed-off shotgun, wrapped it in a blanket, and gave it to Alexis, the affidavit said.

The police allege that Bedame, Ndoye, Alexis and another boy then drove to South Providence. They parked in a vacant lot on Gallup Street, and Alexis and the other boy got out of the car. Colfax Street was a block away.

The detectives later learned that the boy knocked on a window at 145 Colfax St. to draw attention, then Alexis fired one shot, the police allege. The two young men ran back to their friends in the car.

They headed back to Woonsocket, the affidavit said, Alexis holding the spent shotgun shell, �excited� that it was �still hot.�

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