Ontario Provincial Police say the investigation continues this morning after a head-on collision east of Peterborough left four people dead.

Highway 7 has reopened after investigators combed the scene near Drummond Line where an SUV and pickup truck crashed at around 5:15 p.m. on Tuesday.

Four people died and another person was sent to a Toronto-area hospital with life-threatening injuries.

Police say they are waiting this morning on an update on the person sent to hospital.

The highway was closed for several hours as police documented and reconstructed the crash scene.

Police have not released any further details about the victims.