Las Vegas police believe that the 10 to 15 young men who pummeled an MGM Grand maintenance worker were involved in at least five other attacks

Mike Kalil:

The rampage included beatings of at least five people, the pillaging of a northwest valley convenience store and a shooting in a park.

Robbery investigators confirmed Tuesday that they arrested one teen in connection with the beating of the MGM employee.

In that case, the man's two-way radio and cell phone were stolen by his attackers. Police said robbery also was involved in five of the six other cases.

Surveillance video that captured the assault at the MGM led police to arrest 18-year-old Daryle Williams of Las Vegas on Monday, police said.

Williams remained jailed Tuesday night on charges of conspiracy to commit robbery and conspiracy to commit battery with substantial injury, according to Clark County Detention Center records.

Lt. Ted Snodgrass, commander of the robbery unit, said Tuesday that more arrests were imminent.

The group of men that police say Williams was running with began its spree with a robbery at 12:55 a.m. Saturday outside the Metropolitan Police Department's jurisdiction, police said.

Snodgrass refused to provide more information about the case, because it was initially handled by another department. It most likely occurred in North Las Vegas or Henderson.

About 90 minutes later, the band of thugs surfaced at the MGM, then committed another robbery a short distance from there about 30 minutes later, police said.

In the wee hours of Sunday, they committed a string of crimes around Tenaya Way at Vegas Drive.

Detectives connected the cases using video footage from three of the scenes and through the many similarities among them, including nearly uniform witness descriptions of the suspects -- black men in their late teens or early 20s -- and the unusually high number of assailants reported after each attack.

"We just don't get this many suspects at one time," Snodgrass said of the group, which numbers 10 to 15.

The case also stood out because of the brutality depicted in the MGM footage, showing the group swarming their target and taking turns landing blows on him.

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