A red flag was deployed just over 20 minutes into the sole free practice session at the Circuit of the Americas.
The track is hosting the United States Grand Prix this weekend, round 19 of the season.
Drivers took to the track early on to get an eye in ahead of sprint qualifying later today - but found themselves forced to return to the pits in the first half of the outing.
A red flag was deployed as debris was reported on the exit of Turn 19, posing a hazard to the drivers.
The piece of carbon came off Lance Stroll's Aston Martin after the Canadian driver ran wide.
It did not take long for the marshals to clear the debris, allowing the session to get back underway.
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