New Delhi, Oct. 24 -- An FIR has been registered against unidentified persons after two posters questioning the government's performance were found pasted inside a train on the Delhi Metro's Airport Express Line, Delhi Police said.

According to Delhi Police, the FIR has been registered under the Delhi Prevention of Defacement of Public Property Act, 2007, and the Metro Railways (Operation and Maintenance) Act, 2002. Police have seized the posters, while the Special Cell is also involved in the investigation.

Commenting on the incident, former Delhi Police DCP LN Rao said the act of putting up the posters appeared to be part of a larger conspiracy and that the investigation would establish who was behind it.

He said, "The act of putting...