One person was killed while 17 were left critically injured after a portion of an under-construction building collapsed in Kandanchavadi area here on Saturday.
Out of the 17 people injured, five are left with head injuries, along with two in critical condition.
P.Ponniah, district collector, said, "23 people have been rescued so far. Rescue operations will continue."
Earlier, eight ambulances and three fire tenders were pressed into action after reports of the mishap surfaced.