Two track marshals chased the long-tailed reptile and the session resumed shortly after.
Title challenger Lando Norris of McLaren set the fastest time, while standings leader Max Verstappen was fourth-fastest and reported his Red Bull car felt better than it had during a difficult second practice session the day before.
Qualifying for the Singapore Grand Prix is later Saturday and the race is Sunday.
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AP auto racing: https://apnews.com/hub/auto-racing