Hong Kong chief executive Tung Chee-hwa has resigned as the head of government in the former British colony.
He told a news conference that he was stepping down after eight years because of declining health.
However, many observers in Hong Kong believe that he was in fact sacked by the Chinese leadership.
He had faced growing unpopularity over failed plans for an anti-subversion bill and his continued support for Beijing in limiting democratic reforms.
It is the first leadership change since Hong Kong returned to Chinese rule in 1997.
'Punishing schedule'
Mr Tung told a news conference that he had tendered his resignation as Hong Kong's chief executive an hour earlier, two years before his term was due to end.
HK looks to life after Tung
He denied that he had been sacked and said he was leaving to become vice-chairman of the Chinese People's Political Consultative Conference in Beijing after a period of rest.
He said working long hours had taken a toll on his health and he could no longer work what he described as a "punishing schedule".
He said doctors had told him he had to change the way he worked and lived.
HAVE YOUR SAY
Mr Tung looked back on his time in charge of Hong Kong, saying that he and the territory's people had "embarked on a road never before travelled" when he was appointed eight years ago.
"During this time, we have successfully implemented the one country, two systems principle. For the first time in history, Hong Kong citizens began to take charge of their own affairs," he said.
Unpopular
DONALD TSANG
Rumours of Mr Tung's impending departure began circulating last Monday after details of the 67-year-old former shipping magnate's new job emerged - a move some saw as a way of easing him out of office in Hong Kong.
Factors that had fuelled Mr Tung's unpopularity since he took over his job in 1997 included:
Mr Tung's deputy, Donald Tsang - a veteran of the British civil service - is to take over from him as acting chief executive until a new permanent replacement is chosen.
Under the Basic Law, Hong Kong's mini-constitution, the Beijing-appointed 800-strong committee which chooses Hong Kong's leader must hold an election within six months.
The BBC's Chris Hogg in Hong Kong says Mr Tsang is the front-runner to fill the post on a permanent basis.
However, it is not yet clear whether Mr Tung's successor will merely serve out the remaining two years of his term or have a five-year mandate of his own.
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