June 4, 2011 - Vice President Abed Rabbo Mansour Hadi is left in charge while President Saleh travels to Saudi Arabia to undergo medical treatment.
June 5, 2011 - Tribal leader Sadeq Al-Ahmar agrees to a cease-fire with Interim President Hadi.
June 6, 2011 - It is revealed that President Saleh is being treated for burns over 40% of his body and a collapsed lung.
June 7, 2011 - Tribal fighters take control of the city of Taiz.
June 15, 2011 - Interim president Abdu Rabu Mansoor Hadi meets with members of Yemen's youth revolutionary movement.
June 29, 2011 - Interim president Abdu Rabu Mansoor Hadi tells CNN in an interview that the government has lost control over five provinces.
August 18, 2011 - The Yemeni government officially accuses Hamid al-Ahmar, the opposition's wealthiest businessman, and Ali Mohsen, the most powerful military leader in the country of planning the assassination plot on President Ali Abdullah Saleh two months ago.
September 2, 2011 - Approximately two million people demonstrate across Yemen, demanding that the military remove President Ali Abdullah Saleh from power.
September 23, 2011 - President Saleh returns to Yemen, after more than three months of medical treatment in Saudi Arabia.
For developments in Yemen after 2011 -- see Yemen Fast Facts