"Security of justices Dipak Misra, Prafulla Chandra Pant and Amitava Roy has been increased. It is a precautionary step," a Home Ministry official said.
The number of police personnel at their homes has been increased besides increase in patrolling by Delhi Police around their vicinity.
The three-judge bench had upheld the death warrant against the 1993 Mumbai blasts convict.
The bench also dismissed a petition filed in the wee hours today seeking stay on Yakub's death warrant. The plea was made after the President last night rejected Yakub's second mercy petition.
Meanwhile, Home Ministry has sent a country-wide advisory for extra vigil and deployment of forces in sensitive areas. Paramilitary forces in the bordering states have been asked to maintain high surveillance.