SANTIAGO, Chile (NEWSnet/AP) — At least two rail workers were killed and nine other people were injured Thursday when a freight train collided head-on with another on a test run near Santiago, Chile.

Police are investigating to determine the cause of the collision, which left the test car sitting fully atop of the freight train.

Authorities detained the driver of the test train and a railway operator for interrogation on charges of reckless manslaughter.

Train service in Santiago was suspended following the crash.

The eight-car freight train was carrying 1,346 tons of copper, Chile’s main export, and had some people aboard. The other train had 10 workers operating a speed test, the state rail company said.

Security camera footage showed both trains traveling at high speed when the collision occurred.

Authorities identified the two people killed as crew members on the freight train. Another nine people were injured, including four who were operating the test train. Medical workers said six people remain hospitalized, among them one in intensive care.

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