More than 10,000 men at police stations across the city have been kept on alert, and all leave has been cancelled, a highly-placed Mumbai police official told HT.
Three additional companies of the Rapid Action Force (RAF) have been deployed, along with 2,000 additional forces which were summoned from outside the city early on Thursday.
An additional 5,000 men were called in from the Mumbai police reserve.
Police officials have assured there is no security or law-and-order problem, and that all possible precautions have been taken as a large number of Sena party workers are visiting the city.