The incident took place midway during England's innings on Saturday in the north-east corner of the ground, according to an espnricinfo report.
According to the Daily Telegraph, a section of the floor appeared to have caved in. Reports said a female spectator was injured after falling through the hole.
The Durham County Cricket Club said that three spectators were injured when a small section of the North-East Terrace flooring became unstable causing them to fall.
"Stewards took precautionary action and evacuated that area of the stand efficiently. The stand is a permanent fixture at the venue and had passed inspections in the week prior to the match."
West Indies won the match by 21 runs.
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