WOODSTOCK, Ill. (CBS) -- Two people are in critical condition, and a third is injured after a crash involving a motorcycle and a minivan in Woodstock Saturday afternoon. 

According to the Woodstock Fire/Rescue District, firefighters arrived at the crash around 2:25 p.m. at the intersection of Route 176 and Dean Street, where a bystander was already performing CPR on one of two downed motorcycle riders who were unconscious on the pavement.

Paramedics took over, and Route 176 was closed in both directions. 

A man was transported to Northwestern Medicine Woodstock Hospital. A woman was airlifted by helicopter to Advocate Condell Medical Center in Libertyville. Both sustained critical, life-threatening injuries, officials said. 

The man who was driving the minivan was transported to Northwestern Medicine Huntley Hospital with moderate, non-life-threatening injuries. 

The Lakewood Police Department and McHenry County Sheriff's Office are investigating.