Chief Minister Pinarayi Vijayan made the announcement in the state assembly even as Congress-led UDF opposition staged a walk out alleging police inaction and demanding action against "erring" investigators.
The body of the girl was found in the backwaters near Ernakulam wharf last week and the family has said she died under mysterious circumstances as there was no possibility of her committing suicide.
Replying to a notice of adjournment motion moved by Kerala Congress (J) leader Anoop Jacob, Vijayan said a special investigation team of the Crime Branch would probe the case. He said investigation was going on in the right direction and those responsible would be brought before law, however, highly-placed they may be.
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He alleged that police 'inaction' to accept the complaint led to the girl's death.
Accusing police of trying to turn every such 'unnatural' death into suicides, he said "Atrocities against women and children are on the rise in the state. The government is making only pronouncements, but in reality nothing seems to be happening," he charged.
CCTV visuals of a local church had showed that two persons, on a motorbike, were seen following her just before she had gone missing, Jacob said rejecting the Crime Branch probe as inadequate.
Meanwhile, the girl's family today alleged that police did not act effectively when they lodged a missing complaint with police in Ernakulam on March 5, the day she had gone missing.
Shaji Varghese, the girl's father, asked the government to launch a thorough probe to solve the mystery behind his daughter's death.
In a related development, an all-party meeting held at Piravom today called for a dawn to dusk hartal in the Municipal area tomorrow in protest against police's 'failure' to solve the case.
The meeting also decided to send an all party delegation along with the girl's family to meet Chief Minister Pinarayi Vijayan, seeking justice to the girl's family.