Mamta Molla pushed the women police personnel and escaped from their custody yesterday, they said.
A case has been registered at the Barakhamba Road police station after sub inspector Prosenjit Jana informed the police about the incident.
Jana said they had arrested two persons - Molla and Sukhdev Das - in a kidnapping case on July 4.
They duo was in police remand and were in Delhi for further investigation. Along with the accused, two sub- inspectors, two women police personnel and two other constables were staying at the Bangla Bhawan, police said.