Burkina Faso President Blaise Compaore has left power, according to a colonel in the presidential guard.
Lieutenant-Colonel Issaac Zida made the announcement in the central Place de la Nation in Burkina Faso's capital Ouagadougou.
In a statement Mr Compaore called for a 90-day transition to "free and transparent" elections in the west African country.
"I declare a vacancy of power with a view to allowing a transition that should finish with free and transparent elections in a maximum period of 90 days," said the statement, which was read on local radio and television by presenters.
Burkina Military Chief General Navere Honore Traore has said he has taken over as head of state.
In a statement General Traore said "in line with constitutional measures, and given the power vacuum... I will assume as of today my responsibilities as head of state."
Tens of thousands of people had gathered to demand Mr Compaore's resignation after violent protests in the country yesterday.
French president Francois Hollande has welcomed the resignation of Mr Compaore, calling for rapid, democratic elections to find his successor.
Separately, Omega radio in Burkina Faso reported that Mr Compaore had issued a statement announcing his resignation and saying that the head of state's position was now vacant.
Earlier, an army official claimed that Burkina Faso's embattled President had been ousted.
"Compaore is no longer in power," Colonel Boureima Farta told tens of thousands of protesters who erupted in cheers in front of the army headquarters.
Mr Compaore had vowed to stay in power at the head of a transitional government until after elections.
His decision came despite opposition calls for him to step down immediately following a day of violent protests.
General Traore, had earlier dissolved parliament and announced talks with all political parties to create an interim government to take the west African country to democratic elections within a year.
The move came after at least three protesters were shot dead and scores wounded in clashes with security forces.
Demonstrators attacked the homes of senior members of the ruling party and symbols of Mr Compaore's long rule.
Hundreds of people had earlier stormed parliament, looting the building and setting it on fire, while others ransacked state television, forcing it off the air.
Protests also gripped Bobo Dioulasso, Burkina's second-largest city, and other towns across the gold and cotton-producing country.
Mr Compaore, who seized power in a military coup in 1987, said he had dissolved his government and was lifting martial law that was announced earlier in the day.
He also scrapped plans for an unpopular constitutional amendment that would have allowed him to seek re-election next year, a prospect that had sparked yesterday’s protests.
Regional West African bloc ECOWAS had said earlier yesterday that it would not accept any party seizing power through non-constitutional means - suggesting diplomatic pressure to leave Mr Compaore in place.
A delegation from the African Union, the United Nations and ECOWAS was due in Burkina Faso today to hold talks with all parties involved.
Key dates:
Blaise Compaore served two seven-year terms before a change to the constitution allowed him to serve another two five-year terms.
He had been seeking to amend the constitution to be able to run for re-election once again in 2015.
- 15 October 1987: Compaore seizes power in a coup in which his former friend and one of Africa's most loved leaders, Thomas Sankara, is ousted and assassinated.
Compaore quickly launches a "rectification" of Sankara's "democratic, popular revolution", that include the execution of two other comrades in arms accused of plotting yet another coup.
- 2 June 1991: A new constitution establishes a multi-party system and brings an end to 11 years of military rule.
- 1 December 1991: Compaore is elected president, but the vote is marked by an opposition boycott.
- 15 November 1998: Compaore is re-elected at a vote marked by another opposition boycott.
- 13 December 1998: The bodies of journalist Norbert Zongo and three others are found in a burned vehicle as he investigated a murder that might have had links to Compaore's brother Francois.
An unprecedented political and social crisis ensues.
- 11 April 2000: Deputies modify the constitution to give the president a five-year mandate, renewable once. In 1997, deputies had approved an unlimited number of seven-year terms.
- 7 October 2003: Authorities say they have foiled an attempted coup. Togo and Ivory Coast are suspected of involvement, but deny links with the putschists.
- 20-21 December 2006: Clashes between police and soldiers in which five are killed and several dozen injured in the capital.
- February and March 2008: Violent demonstrations erupt against the high cost of living.
- 21 November 2010: Compaore wins the presidential election at the first round. Opposition candidates reject the outcome and denounce "serious irregularities".
- March-June 2011: Protests break out over high food prices, unemployment, rising costs and looting by troops. Soldiers and paramilitary police join the unrest in April, going on the rampage in several towns.
Compaore is forced to leave the capital for a short time, and then names himself defence minister.
- 2 January 2013: Compaore forms a new government, keeping the role of defence minister.
- 12 December 2013: Compaore mentions plans for a referendum on changes to Article 37 of the constitution, which limits presidential mandates to two. Opposition figures accuse him of preparing a "constitutional coup".
- 28 October 2014: Hundreds of thousands - one million according to the opposition - take to the streets to denounce the constitution plan.
- 31 October 31 2014: A day after demonstrations in which protesters set the parliament and other buildings ablaze, Compaore announces that he is stepping down. Burkina's army chief, Navere Honore Traore, takes power.
