Two people were killed and two others seriously injured in a crash Sunday near Chiloquin in Klamath County, according to Oregon State Police.

Police said Wyonna Elaine Weiser, 38, of Chiloquin, was driving south in a Ford Expedition when her vehicle slid sideways into the northbound lane and was struck by a Ford F-350 towing a horse trailer, driven by Franklin Scott Maricle, 31, of Bend. The crash sent the Expedition into a ditch, while the F-350 came to rest blocking the highway.

Two passengers in the Expedition, Winnie Mae Hescock, 41, of Klamath Falls, and Laurice Lee Foster, 41, of Chiloquin, died at the scene. Weiser and another passenger, Wauseka Brown Jr., 56, of Chiloquin, were taken to a hospital with serious injuries.

Maricle and his passengers — Scott Nile Maricle, 58, of Bend, Janelle Marci Maricle, 32, of Bend, and two children, 21 months and 13 months — were not injured.

The crash remains under investigation.