NEWBURYPORT (CBS) — One worker received moderate to severe facial burns when a trench he was working in became engulfed in flames, fire officials said Tuesday.

That sub-contractor and a National Grid worker were digging near gas lines in the trench on High Street and Park Street when the accident occurred in the afternoon, officials said.

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The National Grid worker, who suffered minor facial injuries, pulled the sub-contractor out of the trench. Both were taken to a local hospital.

The cause of the fire is under investigation, but there was welding going on, officials said.

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The Occupational Safety and Health Administration has been notified, according to officials.

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