A Russian passenger plane slid off a runway and and crashed onto a highway outside a Moscow airport Saturday, killing four of the eight crew members on board.

The Russian-made TU-204 aircraft was flying back from the Czech Republic as it tried to land at Vnukovo Airport. After sliding off the runway, the plane broke into pieces with its cockpit on top of the icy highway and the remainder of the mangled jet resting just past the airport fence.

Officials say the other four crew members were injured in the accident.

No passengers were on the plane at the time.

An investigation into the cause of the accident is underway.

The TU-204 plane is a Soviet-era design that was produced in the mid-1990s. There have been no major accidents reported involving TU-204s.

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