(CNN) -- Two people died and one was injured Thursday night when a medical helicopter went down in Oklahoma, authorities said.
The crash happened near Kingfisher, which is about 50 miles northwest of Oklahoma City.
Authorities were alerted about the crash at 9:25 p.m., the Oklahoma Highway Patrol said.
The helicopter flight was a training exercise, the highway patrol said.
CNN's Scott Thompson and Samuel Gardner contributed to this report.