(CNN)Here's some background information about the Arab Spring, anti-government protests that began in Tunisia in December 2010 and spread quickly throughout the Middle East and Africa in 2011.
January-February 2011 - Sporadic demonstrations and self-immolations in opposition to the government occur.
February 2011 - Anti-government demonstrations break out, quickly becoming violent as security forces and protesters clash.
January 28, 2011 - Peaceful demonstrations begin.
February 18-19, 2011 - Hundreds of protesters gather to demand greater rights for longtime residents and to seek the release of previously arrested protesters. They clash with security forces.
December 17, 2010 - Mohamed Bouazizi, a 26-year-old vegetable cart vendor, sets himself on fire in protest after police confiscate his cart. He dies on January 4, 2011.
January 28, 2011 - Protests break out in Yemen.