New Delhi: Terming the situation in flood-hit Chennai as 'very alarming', Home Minister Rajnath Singh today said in the Lok Sabha that the Centre will extend all possible assistance to the state governments in dealing with natural calamities.

"It would not be an exaggeration to say that Chennai has become an island as it has been cut off from all national and state highways," he said, responding to a discussion on the flood situation in Tamil Nadu, Pudducherry and Andhra Pradesh.