March 21, 2011 - Three of Yemen's top generals declare their support for the protesters, including Major General Ali Mohsen al-Ahmar. Also declaring their support are Yemen's ambassadors to Great Britain and the European Union and dozens of other ambassadors and officials.
March 23, 2011 - Presiden Saleh offers to step down as president by the end of year. Opposition groups reject his proposal.
March 25, 2011 - Rival demonstrations in Sanaa reportedly bring out large crowds. President Saleh tells a crowd of supporters that he's ready to talk to the opposition.
March 28, 2011 - An explosion at an ammunition factory in Jaar kills 150 people. They were allegedly looting the factory at the time of the blast.
April 1, 2011 - Tens of thousands of people turn out in Sanaa to demonstrate both for and against the government.
April 8, 2011 - Tens of thousands of demonstrators gather in Sanaa and Taiz. At least two people are killed in Taiz when security forces use tear gas and live ammunition on the crowd.
April 10, 2011 - The Gulf Cooperation Council releases a statement urging President Saleh to transfer power to his vice-president.
April 11, 2011 - Thousands of people protest against President Saleh.
April 23, 2011 - Yemeni President Saleh accepts a deal, arranged by the Gulf Cooperation Council, to leave office. The agreement states if Saleh resigns the presidency within 30 days, he and members of his regime will be given total immunity. Saleh has accepted the deal in principle, but has not yet signed it.
May 1, 2011 - The Gulf Cooperation Council agreement is not signed in Saudi Arabia, as planned, when Saleh refuses to sign it in his capacity as president. He wants to sign it in his capacity as leader of the governing party.
May 8, 2011 - At least 6 people are killed in a demonstration in Taiz. The demonstrators were teachers protesting salary cuts.
May 11, 2011 - 13 protesters are killed in demonstrations Sanaa and Taiz.
May 22, 2011 - Saleh again refuses to sign the deal to step down. The Gulf Cooperation Council suspends its efforts to mediate a deal between Saleh and opposition forces.
May 23, 2011 - Fighting breaks out in Sanaa between government forces and the supporters of Sheikh Sadiq al-Ahmar, the head of the Hashid tribal federation, after Saleh refuses to step down.
May 25, 2011 - Hashid tribal forces take control of the Interior Ministry, SABA state news agency and other government buildings.
May 25, 2011 - The U.S. orders families of government employees and others to leave Yemen, citing "terrorist activities and civil unrest."
May 26, 2011 - Street battles between government forces and Hashid tribal forces continue throughout Sanaa.
May 29, 2011 - In Taiz, security forces fire on tens of thousands of demonstrators, killing dozens.
May 30, 2011 - Security forces use bulldozers and water cannons to try to disperse demonstrators in Freedom Square in Taiz. The protesters' tent encampment is also burned down.
May 31, 2011 - Hashid tribal forces take command of more government buildings.
May 31, 2011 - Street battles between government forces and Hashid tribal forces continue throughout Sanaa.
May 31, 2011 - Missiles strike a compound where opposition generals are meeting. No one is injured.
June 2, 2011 - A group of about 1,000 armed tribesmen, supporters of Sheikh Sadeq Al-Ahmar, are seen entering Sanaa by residents.
June 2, 2011 - All inbound and outbound flights to and from the Sanaa International Airport are suspended due to security concerns.
June 3, 2011 - Opposition forces launch missiles at the presidential palace, slightly injuring President Saleh and killing several others.