TIMELINE: Somalia's President resigns

(Reuters) - Somali President Abdullahi Yusuf resigned on Monday, ending a deadlock at the top of the interim government.

Here is a timeline of events since Islamists first seized the capital, Mogadishu:

June 2006 - The Somalia Islamic Courts Council (SICC) seizes Mogadishu from U.S.-backed warlords and takes control of parts of southern Somalia.

December 28 - Islamists flee Mogadishu ahead of a joint Ethiopian and Somali government force which captures the city.

January 8, 2007 - Yusuf arrives in Mogadishu for the first time since he became president in 2004.

August 30 - Yusuf winds up a six-week-long peace conference, which has no visible impact on growing insurgency. Islamists and some other opposition figures boycott the talks.

May 1, 2008 - U.S. air strike kills al Shabaab leader Aden Hashi Ayro.

August 18 - Somalia formally signs a peace deal with some opposition figures, but the pact is rejected by hardliners.

August 22 - Al Shabaab insurgents seize Kismayu, a strategic southern port, after fighting that killed 70 people.

August 25 - The U.N.'s Food Security Analysis Unit says more than 3.2 million people need humanitarian aid.

November 12 - Rebels take the port of Merka, 90 km (56 miles) southwest of Mogadishu, after government-aligned militia leave.

November 14 - Al Shabaab fighters move into Elasha town near Sinkadheer, where Ethiopian troops are based. Sinkadheer is 15 km (9 miles) southwest of Mogadishu.

-- President Yusuf admits Islamist insurgents control most of the country and raises the prospect his government could completely collapse.

November 15 - The Sirius Star, a Saudi super tanker, is hijacked by pirates southeast of Mombasa. The tanker is carrying $100 million of oil.

November 28 - Ethiopia says it will withdraw its troops from Somalia by the end of this year, piling pressure on Somalia's feuding government.

December 10 - Somalia's moderate Islamist leader Sheikh Sharif Ahmed returns to Mogadishu for the first time in two years. A local rights group says 16,210 civilians have been killed in fighting since then.

December 11 - Ethiopian Prime Minister Zenawi says that African Union peacekeepers have asked Ethiopian troops planning to leave the country to help them quit Mogadishu too.

December 14 - Yusuf sacks Prime Minister Nur Hassan Hussein, saying the government has failed to extend security to the nation. The next day parliament votes to reinstate him.

December 16 - Yusuf names former interior minister Mohamed Mohamud Guled as prime minister, snubbing parliament. Guled resigns on December 24, saying he did not want to be an obstacle to peace.

December 29 - Yusuf resigns and says that speaker Sheikh Aden Madobe will take over.