The security has been stepped up at all the vital installations and sensitive locations in Mumbai, he said.
"We have issued an alert in the state on the basis of inputs from the central agencies for the Republic Day celebrations," Director General of Police (Law and Order) Bipin Bihari told PTI.
The superintendents of police in all the districts and commissioners in cities have been alerted to handle any untoward situation, he said.
The police is also conducting checks at all vital points and combing in sensitive areas, he said.
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Heavy security cover will be provided at the important venues for celebrations and flag-hoisting, a police official said, adding that the snipers are also kept on alert.
At the important venues, the police will ensure access control and conduct anti-sabotage checking.
The dog squads, and bomb detection and disposal squads will also be deployed, wherever required, he added.