A Youth Olympic Games (YOG) bus was in a seven-vehicle chain collision on the expressway this Friday morning.

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Police received a call at about 8.40am about the accident. A spokesperson said the accident happened along the Pan Island Expressway (PIE) towards Tuas, near Clementi Ave 6.

When the police arrived at 9am in response to the call, the YOG bus had already left. No one was injured.

Police said it was a "very minor accident" and there was no traffic jam.

Local media reported that the bus was travelling from Bishan Stadium to the bus holding area in Boon Lay.