Luz Adriana Camargo will lead probes into President Petro and his son after weeks of delay in the appointment process.
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Officials hope Salvatore Mancuso will reveal information about hundreds of murders and forced disappearances.
In 2023, Chinese migrants become the largest group outside the Americas to cross the treacherous region to reach the US.
The two sides have agreed to extend a landmark deal struck in August that expired last week.