However, there was no casualty or damage to property, they said. Restoration work was on.
Following the incident, vehicular traffic was regulated for a while and some diversions effected.
A similar incident had happened in Anna Salai last year, when a section of the road suddenly caved in near the site of an underground tunnelling for the Metro Rail.
The passengers of a bus evacuated the vehicle after the driver raised an alarm and a car's occupant jumped out after the earth started buckling in then.
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