Alcohol is believed to be a factor in two separate rollovers near Melfort Friday night.

One crash resulted in the death of an 18-year-old man and saw two other men flown via STARS air ambulance to Saskatoon with serious injuries. The second crash saw a 19-year-old man with life-threatening injuries also transported to Saskatoon via STARS.

Both crashes were single-vehicle rollovers involving pickup trucks.

Melfort RCMP were called to the first rollover just before 8 p.m. on a grid road about five kilometres northeast of Lac Vert, Sask. The 18-year-old pronounced deceased on scene was ejected from the pickup truck, according to police.

Five other people were transported to Melfort Hospital before two were moved to Saskatoon.

The second crash occurred just before midnight on a grid road about eight kilometres northwest of Kinistino, Sask.

The 19-year-old driver was ejected from the pickup truck before he was moved to Saskatoon with life-threatening injuries. A 21-year-old man, who was a passenger in the truck, was transported to Melfort Hospital with non-life-threatening injuries, RCMP said.

Police said they believe alcohol is a factor in both crashes.