Four persons were killed and 13 were injured on, six of them seriously, when members of two communities clashed over a place of worship on Thursday.
Soon after, an indefinite curfew was imposed in three police station areas of the communally sensitive city.
Agra Range IG Rizwan Ahmed said that two persons were brought dead to Jawaharlal Nehru Medical College while two others succumbed later on.
The members of a particular community removed the decorative lights put up at a temple on Wednesday evening in view of navratri festival, leading to a clash with members of the other side in Sabzi Mandi and Dahi Wali Gali areas.
Nearly 1,000 Rapid Action Force and state paramilitary personnel, along with a large number of police personnel, have been deployed and patrolling has been intensified to maintain law and order, Ahmed said.
Indefinite curfew was imposed in Kotwali, Delhi Gate and Sasni Gate police stations areas in the old city following the clash during which the two sides hurled stones at each other and fired from rooftops.