A police cordon is in place near the Buttermarket in Ipswich following reports of an incident.
Officers are currently guarding a scene in Falcon Street, which runs from the taxi firm to the hairdressers.
There is currently no access to the Buttermarket car park.
The nature of the incident is not clear yet and Suffolk police has been contacted for further details.
Road closures are in place with bus services to the Old Cattle Market being diverted.
Ipswich Buses tweeted: "We are sorry to inform you that due to a police incident buses are unable to serve Falcon Street, Dogs Head Street and the bus station.
"Our country services 92,93,97,118,119 will be departing from Friars Street (Willis Building)."
Suffolk Police have since confirmed that a woman was assaulted. More details are available here.
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