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Investigators believe Justin Bieber was in the limo at the time of the alleged attack. (Kevin Winter/Getty Images)

There are allegations a member of Justin Bieber's entourage assaulted a limo driver who was driving the pop star and several others around Toronto.

Police say it's unclear whether Bieber himself is accused in the attack or simply one of his companions.

Const. Victor Kwong says officers were called either late last night or early today, but little else is known about the incident.

Bieber, 19, was seen at the Air Canada Centre during last night's hockey game, but investigators believe he was in the limo at the time of the alleged attack.