Drivers were surprised to see a damaged bus near the Bentalls complex, Heybridge, yesterday.
Nobody was hurt in the incident, which happened shortly after midday.
A spokesman for First Bus said: "We are aware of an incident involving one of our vehicles which happened at 12.45pm on Tuesday, September 30, on the B1022 in Heybridge.
"A bus collided with a lamppost and nobody was injured.
"We are working with police and we have launched an internal investigation to establish the cause."
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