India, Nov. 24 -- A protest against Delhi's worsening air quality at India Gate spiralled into violence on Sunday evening, with police arresting over 22 demonstrators after some allegedly used chilli spray on personnel attempting to clear the blocked road.

The protests also witnessed slogans and posters praising slain Maoist commander Madvi Hidma.

2. Chilli spray used on police: Police said protesters refused to move despite repeated requests to clear the way for ambulances. During the scuffle, several demonstrators allegedly used chilli or pepper spray on officers - an "unusual" first, according to DCP Devesh Mahla.

3. Four police personnel injured: Officers sustained eye and facial injuries and were admitted to RML Hospital. Police d...