Three men are dead — including one from Toronto and another from Oshawa — after a multi-motorcycle crash in the Kawarthas on Sunday.

The crash happened around 12:30 p.m. on Highway 507 in the area north of County Road 36 in the Township of Trent Lakes, Ontario Provincial Police say.

Greg Campbell, 43, from Toronto, Mark Langhorne, 40, from Oshawa, and Scott Knill, 45, from Woodville all died in the crash.

According to social media posts, Campbell and Langhorne were part of Nasty North Ryderz Evolution, a Toronto-based motorcycling group.

"It's with a heavy heart that we must accept that we have lost two of our family members," reads an Instagram post from the group.

A GoFundMe page has also been set up for the two men to raise money for their families.

"NNRe lost two brothers that day, but their families will feel an even greater loss," reads the page.

OPP investigating still ongoing

The OPP's investigation found one of the riders in a group of 11 northbound motorcycles crossed over the center line in a curve and collided with two southbound motorcycles, who were part of a group of three.

Soon after that first crash, another northbound motorcyclist hit a car that had stopped at the scene and another northbound motorcyclist went off the roadway and into the ditch.  

One person was also sent to hospital with life-threatening injuries.

The OPP investigation is still ongoing.