Around 32,000 security personnel have been deployed across the Indonesian capital Jakarta after early "quick count" results confirmed Joko Widodo's victory in last month's elections.
Some schools have announced closures, while local offices have allowed staff to work, amid threats of protests by rival Prabowo Subianto's supporters.
The retired general, who was handed 44.5 per cent of the votes by the General Election Commission (KPU), "completely rejected" the results, and pledged to "continue to make legal efforts in line with the constitution to defend the mandate of the people".
Widodo, who won 55.5 per cent of the votes, said he will be a leader for all Indonesians.
"We are grateful and proud that amid our differences, we have been mature in keeping the peace," he said.
The Utah trade school student jailed on suspicion of fatally shooting conservative activist Charlie Kirk faces formal charges next week, according to the governor, from an act of violence widely seen as a foreboding inflection point in US politics.
Indian Prime Minister Narendra Modi appealed for peace on Saturday in Manipur state, the scene of two years of deadly ethnic violence, as he unveiled a package of development projects there worth nearly $1 billion.
European Union countries have shelved plans to approve a new climate change target next week, after pushback from governments including France and Germany over plans to quickly land a deal, three EU diplomats said on Friday.
Nepal's President Ramchandra Paudel dissolved parliament and called for fresh elections on March 5, his office said late on Friday, following a week of deadly violence that culminated in the appointment of the country's first woman Prime Minister in the interim.