Malaysian Prime Minister Mahathir Mohamad, at 94 the world's oldest leader, submitted his resignation to the king Monday after a bid by his allies to bring down the government and block the succession of leader-in-waiting Anwar Ibrahim.
The shock move followed 24 hours of political drama which saw an attempt by Anwar's rivals within his own "Pact of Hope" coalition, which stormed to a historic election victory in 2018, and opposition politicians to form a new government.
The coalition would reportedly have excluded Anwar, Mahathir's presumptive successor, and most of the lawmakers from his party, which would have stopped him becoming premier any time soon.
Anwar and Mahathir have a notoriously stormy relationship but they reconciled ahead of the 2018 polls, and Mahathir has repeatedly promised to hand over power to his former foe.
The bid appeared to have fizzled out by early Monday, however -- before Mahathir's office announced he had "sent a resignation letter as prime minister of Malaysia" to the king at 1pm.
What would happen next was far from clear, however.
Anwar was due to meet the king Monday afternoon. While the monarch's role is largely ceremonial, he confirms the appointment of the country's prime minister and Anwar could be hoping to persuade him that he has enough support from MPs to form a government, observers said.
However, Mahathir's party Bersatu also announced it was leaving the "Pact of Hope" coalition -- suggesting they could be making their own attempt to form a government.
Earlier, two of Anwar's rivals from his People's Justice Party, Mohamed Azmin Ali and Zuraida Kamaruddin -- seen as key figures in leading the bid to form a new government and block his ascent -- were sacked, the party announced.
- Ethnic tensions -
Anwar had teamed up with former nemesis Mahathir ahead of the 2018 elections to oust the government of Najib Razak, who had become embroiled in the massive 1MDB graft scandal.
They led an alliance to an unexpected victory against a coalition that had ruled Malaysia uninterrupted for over six decades, and Mahathir agreed to eventually hand power to Anwar.
But Mahathir, in his second stint as premier after first holding the role from 1981 to 2003, has repeatedly refused to say when he will transfer power, stoking tensions within the four-party coalition.
The alliance's popularity had plummeted as it was accused of failing to raise living standards and protect the rights of the ethnic Malay Muslim majority, and it lost a string of local polls.
According to reports, the proposed new government aimed at blocking Anwar would have included Mahathir's party, the United Malays National Organisation -- the party of scandal-tainted ex-leader Najib -- and a hardline Islamist group.
Many were angry, however, that the democratically elected government, which came to power partly on a pledge to push through much-needed reforms, could be replaced without an election.
The people "will not agree to or cooperate with any 'backdoor' government formed out of the selfish, self-preservation agenda of certain MPs", said a statement from a group of leading activists and academics.
Some called for a snap poll, although politicians appeared to be trying to form a new government without holding an election.