Demonstrations over the outcome of last month's presidential election gripped the heart of Indonesia's capital on Wednesday after an overnight face-off between police and protesters in which, according to Jakarta's governor, six people were killed.
Indonesia's Election Commission on Tuesday confirmed that Indonesian President Joko Widodo, also known as Jokowi, has been re-elected with 55.50% of the vote, defeating former army general Prabowo.
Indonesian National Police spokesman Dedi Prasetyo said clashes with police began Tuesday night and continued through into Wednesday morning, adding that at least 20 people had been arrested.
KompasTV showed protesters throwing rocks, a paramilitary police dormitory on fire, and hundreds of riot police in a central neighborhood of the city.
Mr Subianto refused to accept the election results and declared himself the victor, while his campaign announced plans to challenge the election in the Constitutional Court. His challenger Prabowo Subianto has vowed to challenge any victory for Widodo, alleging widespread voter fraud, and warned that it could spark street protests.
Rudiantara, the communications and information technology minister, said social media including Facebook, Twitter and WhatsApp will be restricted on a temporary basis to prevent the spread of hoaxes and inflammatory content.
Iqba said that the riot was "by design" as they had taken packets of money off those who were arrested. Prabowo also launched a legal challenge after he was defeated in the 2014 election by Widodo, which was unsuccessful.
But the violence in Jakarta was a planned act by paid "provocateurs", authorities claimed, citing envelopes with money found on some of almost 70 demonstrators who had been arrested.
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Police have said the rioting was planned rather than a spontaneous outburst.
More than 30 000 troops had been deployed in anticipation of unrest, and the elections commission office was barricaded with razor wire and protected by scores of security personnel.
"Avoid areas where demonstrations are occurring & exercise caution in the vicinity of any large gathering", the USA embassy said on Twitter. Among them was a retired general and former commander of Indonesia's special forces.
"After we're sworn in. we will be president and vice president", Widodo told reporters in Jakarta with running mate Ma'ruf Amin at his side.
Subianto's campaign plans to challenge the election result in the constitutional Court.
Analysts have said Widodo's double-digit margin of victory means the opposition does not have a strong case to claim the election was rigged, but Islamist supporters of Prabowo could cause considerable disruption. "Their aim was definitely to disrupt the situation (around the election protests)", he said.
"We are concerned about the enormous fraud committed in the general elections that we have just carried out", he said in video footage received Tuesday by CNN Indonesia, urging supporters to stay peaceful and not resort to violence.