pTear gas was used to disperse anti-government protesters in central Cairo on Thursday, January 22, just three days ahead of plans for a major demonstration to mark the anniversary of the 2011 Egyptian uprising. Thousands are expected to attend Sunday’s demonstrationa to mark the four-year anniversary of the revolution that toppled Hosni Mubarak. This video shows tear gas being fire at protesters at Talat Harb Square, near Tahrir Square.