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Scott McLaughlin leads the Gateway IndyCar race under a red flag for light rain in St Louis.
The stoppage came shortly after McLaughlin passed Team Penske team-mate Josef Newgarden for the effective race lead as the latter exited the pits following his fourth pit stop.
They had just cycled back to first and second spot when Graham Rahal (Rahal Letterman Lanigan Racing) pitted.
McLaren SP’s Pato O’Ward, who had been 10 seconds back prior to the yellow, sits third, with Will Power fourth in the other Penske Chevrolet.
With 217 laps in the books, the race has easily passed half of its scheduled 260-lap distance and hence full points would be awarded if it does not restart.
As it stands, Power would extend his series lead, which stood at seven points at the start of this, the third-last race of the season.
Update 10:01 AEST
The chance of another green flag coming has fallen as the rain gets heavier, with lightning nearby.
Update 10:26 AEST
Covers have come off the cars, which still sit in pit lane, but there is no word on a restart yet.
Update 10:28 AEST
Rain has stopped.
Update 10:46 AEST
Lightning hold lifted.
Update 11:12 AEST
Restart expected at 21:45 ET/11:45 AEST.
Update 11:27 AEST
Restart target time now 21:00 ET/12:00 AEST.
Update 12:00 AEST
Cars will have a minimum of four laps under Caution before a restart.
Update 12:06 AEST
Engines re-fired; Caution flag out.
More reports to follow
