A Leeds Grenville Paramedic Service spokesperson told CBC that seven people were taken to hospital with injuries. Four ended up at the trauma centre at The Ottawa Hospital's Civic campus, the spokesperson said, with two in critical condition and two in severe condition.
Three others were taken to the Kemptville District Hospital with non-life threatening injuries, according to the spokesperson.
Police told CBC that eight people in total were hospitalized after the collision, but neither they nor paramedics could explain why their counts differed.
The northbound lanes of Highway 416 were closed between midnight and around 2 p.m. on Saturday for the police investigation.
Highway 138 collision turns fatal
A woman also died in a three-vehicle collision on Highway 138 in the Township of North Stormont, according to OPP.
The collision happened just before 9:30 a.m. on Saturday, police said, and involved one car and two tractor-trailers, each with one person inside.