Officials say Marcelo Pecci, a famed anti-mafia prosecutor, was likely targeted by drugs gangs.
Police in Colombia posed for photos with some of the detained suspects earlier this month
Mr Pecci and his wife were on the sixth and final day of their honeymoon when he was killed on Baru, an idyllic island off the Caribbean coast. Authorities believe the Brazilian prison gang First Capital Command, a major exporter of cocaine, was involved in coordinating the murder, but said that they have been unable to identify the mastermind behind the attack.
Just two hours before the attack, Mr Pecci's wife, journalist Claudia Aguilera, had posted a picture on her Instagram account announcing that they were expecting a baby.
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