Dawn.comUpdated 13 Apr, 2021 01:49pm Protests erupted across major cities in Pakistan on Monday after Tehreek-i-Labbaik Pakistan (TLP) chief Saad Hussain Rizvi was detained by security forces in Lahore as a "pre-emptive measure" ahead of the party's April 20 deadline to the government. The deadline pertains to the party's demands from last year; in October, a history teacher who had shown blasphemous sketches of Prophet Muhammad (peace be upon him) in class was decapitated and his assailant shot dead by French police as they tried to arrest him. In the days that followed the beheading, the caricatures were projected onto the facade of a building in one French city and people displayed them at protests around the country.