Rodrigo Duterte has been sworn in as president of the Philippines, after a landslide election victory in May.
The controversial former mayor of Davao City, 71, overthrew the political establishment, promising a "bloody war" on crime and action on corruption.
In his inaugural speech he promised to make sweeping changes to the country's political system.
"I see the erosion of the people's trust in their country's leaders," he said.
"The erosion of faith in our judicial system. The erosion of confidence in the capacity of our public servants to make the people's lives better, safer and healthier."
Mr Duterte, who has barely left Davao in the south since his election win, took his oath at a small ceremony at the Malacanang Palace in Manila. Only state media were permitted to cover the event, but it was streamed live online.
Under the constitution, Mr Duterte and the new vice-president, Leni Robredo, will both serve a single six-year term.
Ms Robredo was sworn in at a separate ceremony in Quezon City.