Security officials at Chennai airport are investigating how a huge hole was drilled in the airport compound wall, giving rise to suspicion of possible attempts to intrude into the high security area.

While high-ranking officers remained tight-lipped about the gaping hole that was noticed near the compound wall at Gate no.8, Airport sources on Saturday said, it was big enough to allow two persons to pass through.

The hole appeared closer to the second runway being built, the sources said.

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