Haas have been forced to halt Kevin Magnussen's running in first practice for the Saudi Arabian Grand Prix after just a handful of laps.
The Danish driver was told not to change gear as he approached the start-finish straight, with his engineers urging him to return to the pit lane immediately.
From there, Magnussen climbed straight out of his car as his mechanics got to work on assessing the issue.
The team say the car has suffered a hydraulic leak, and that it is likely they will be forced to replace the radiator on his car, potentially bringing his session to an end.
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It comes after Haas suffered similar hydraulics issues over the Bahrain Grand Prix weekend, including during qualifying.
Those problems were put behind them by race day, with Mick Schumacher placing 12th at the chequered flag as Magnussen brought his car home in an impressive fifth position.
This weekend, Haas will be looking to prove that they remain the leaders of the midfield pack at a circuit with very different characteristics to Bahrain.
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