The Delhi police has invoked charges under ‘imputations and assertions prejudicial sto national integration’ in one of the FIRs registered against a group of protesters who allegedly raised pro-Maoist slogans and used pepper spray on police personnel during an anti-pollution demonstration at the India, an official said on Tuesday.

The police have registered two different FIRs — one at the Kartavya Path police station against six protesters and the other at the Sansad Marg police station against 17 people. The new section has been added to the Kartavya Path FIR. After the accused were produced before two magisterial courts, 22 were sent to judicial custody.