Keith Urban performs at the CMA Music Festival

Keith Urban performs at LP Field on Saturday, June 7 during the 2014 CMA Music Festival in downtown Nashville.

Donn Jones/CMA

Emergency service workers from six towns responded to numerous reports of illness at a Keith Urban concert in Mansfield, Mass. Officials said alcohol consumption was the likely cause.

Ambulances arrived from Eaton, Foxboro, Mansfield, North Attleboro, Norton and Plainville to help private ambulances services at the Saturday night (July 26) concert at the Xfinity Center, which is located about 35 miles southwest of Boston.

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At about 9 p.m., Mansfield fire officials declared a mass casualty incident at the concert venue, which typically indicates a large number of people with potential illnesses or injuries.

The Sun Chronicle reports that officials requested help for a 16-year-old boy with an unspecified injury and was unresponsive.

Mansfield Deputy Fire Chief James Puleo could not confirm the number of people taken to hospitals.

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