Peru's former President Alberto Fujimori has been extradited from Chile to face trial in his home country, following a ruling by Chile's Supreme Court.
What are the charges against him?
Peru filed an international arrest warrant listing 13 charges. The Chilean Supreme Court accepted seven - two for violations of human rights and five for corruption.
The most serious allegations date back to the early 1990s when the newly elected Mr Fujimori targeted the Shining Path Maoist guerrilla group. He is accused of approving the killing of civilians.
Who did the killing?
There were two massacres - both perpetrated by a militia, the Colina Group, formed by members of the army.
One took place in November 1991 in Barrios Altos, a working-class neighbourhood in the capital, Lima, where the group raided a family party, killing 15 people, including an eight-year-old boy.
In July 1992, the same organisation entered the university of La Cantuta, in the outskirts of Lima, and detained nine students and a lecturer.
They were taken away and summarily executed. Their remains were later found later in a clandestine grave.
So what will happen to Mr Fujimori now?
A handover took place between the Chilean and Peruvian governments on 21 September, and Mr Fujimori was then put on a plane to Lima.
On arrival, the ex-leader will be transferred to a high security prison in the Peruvian capital, where the trial will take place.
He is set to be reunited with Vladimiro Montesinos, his intelligence chief, who is serving lengthy sentences for corruption and human rights violations.
According to Peruvian prosecutors, Mr Fujimori can only be tried for the seven charges for which he is being extradited.
They are seeking a 30-year prison term for the massacres in Barrios Altos and La Cantuta.
Does Mr Fujimori have supporters in Peru?
Yes. Many Peruvians give him credit for defeating the Shining Path. Supporters of the former president told a Lima radio station that Mr Fujimori would obey the law.
They said they expected him to be acquitted of all charges.
Was he a popular leader while in office?
Initially yes. Mr Fujimori was elected in 1990 and re-elected five years later.
But he managed to change the constitution to get re-elected for a third term in 2000. He fled the country that year after denunciations of widespread fraud during the elections.
Where did he go?
To Japan, where his parents were born, and lived in self-imposed exile until 2005.
He then decided to travel to Chile, to prepare for a return to Peru.
His aim was to take part in the 2006 presidential elections, despite the fact that he was banned from Peruvian politics.
He was detained after he arrived in the Chilean capital, Santiago, in November 2005.