Two people were stabbed and three others bashed with a wood plank in a brawl that broke out after a group of recent high school graduates parked their party bus behind a Surrey gas station overnight.

Mounties say about 50 young people, many of whom had been drinking, were on the bus when it pulled into the alley behind a Husky station at 175 Street and Highway 10 at around 11:30 p.m.

A group of them hopped off to buy chips and pop while others milled around in the alley, blocking the path of a van that drove up with two men inside. Surrey RCMP say a confrontation fuelled by “alcohol, testosterone and poor judgment” erupted and quickly escalated into a full-on fight.

“This altercation led to weapons being brandished by both parties including edged weapons, bear spray and a piece of lumber,” Mounties said in a release.

Insp. Al Ramey said two of the recent graduates sustained serious head injuries after being hit with the plank, believed to be a two-by-four. One other youth was stabbed, as was the driver of the van, a 22-year-old who was arrested for allegedly instigating the brawl. He faces charges of assault causing bodily harm.

“We believe he is the primary aggressor,” Ramey said. “He’s been taken to the Surrey police station.”

Mounties say they are considering charges against some of the party bus riders as well.

The bus also sustained damage, including a broken window and partially caved-in roof.

Anyone with information about the incident is asked to call the Surrey RCMP Serious Crime Section at 604-599-0502 or Crime Stoppers at 1-800-222-TIPS if they wish to remain anonymous.