A class action lawsuit has been filed against the Formula One Las Vegas Grand Prix in relation to fans being forced to leave Thursday’s practice session after an hourslong delay.

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Dimopoulos Law Firm and co-counsel JK Legal & Consulting filed the suit Friday in Nevada District Court on behalf of 35,000 fans who purchased tickets to Thursday’s practice run, the legal firms announced Saturday.

Just nine minutes after Thursday’s’s practice session began, a water valve cover came loose and damaged multiple F1 drivers’ vehicles. That led to a 2 ½ hour delay, with a 90-minute second practice session beginning at 2:30 a.m. Friday.

Fans were forced by police and security officers to leave at 1:30 a.m. Friday and weren’t able to watch the session.