Brazilian President Dilma Rousseff has been sworn in for a second term.
In her inaugural address, Ms Rousseff, 67, vowed to extend social welfare programmes that have lifted millions out of poverty.
She also promised to investigate a major corruption scandal involving state-run oil company Petrobras.
Ms Rousseff, a left-wing economist who was arrested and tortured under military rule, was re-elected by a narrow margin in a run-off vote.
Thousands of Ms Rousseff’s supporters turned up for the ceremony in the capital, Brasilia.
Many were wearing the red colour of Ms Rousseff’s Workers’ Party (PT), which has been in power since 2003.
While most of the country woke up drowsy after the New Year celebrations, Brazil’s capital rose early to prepare for the solemn inaugural events that launched President Dilma Rousseff into the start of her second term.
Ms Rousseff’s new mandate starts amid a grim mood with problems ranging from a stagnating economy to the major corruption scandal hitting Brazil’s oil giant Petrobras, once considered the jewel in the Brazilian crown.
But even with this atmosphere, and after a narrow victory that divided the country, Ms Rousseff went ahead and announced a controversial cabinet.
Critics say she has distributed posts to please the parties of the government’s coalition rather than appointments based on political expertise.