Officials were stood down and track action paused, impacting Aussie Racing Car, Touring Car Masters and GR Cup sessions.
Police and security onsite were believed to have been searching an area near Turns 9 and 10, which backs onto a train line.
Officials were given the all-clear to resume track action with the GR Cup just prior to 10am.
Supercars practice is scheduled to get underway at 10:35am local time.
More to follow
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