Police in Peru have arrested a man suspected of having ordered the killing of two 20-year-old women and a 15-year-old girl in Argentina.
The three were lured to a house near the Argentine capital on 19 September.
Their mutilated bodies were found several days later, and police revealed that their killers had livestreamed their torture and killing on Instagram.
The brutality of the crime has sent shockwaves through the region, with thousands taking part in anti-femicide protests in Buenos Aires on Sunday.
The security minister of Buenos Aires province, Javier Alonso, said that cousins Morena Verdi and Brenda del Castillo, both aged 20, and 15-year-old Lara Morena Gutiérrez had been lured by an international drugs gang to the house with a promise of being paid to attend a party.
CCTV footage of them getting into a van with fake number plates enabled police to track them to the house where they were murdered.
Their bodies were found buried in the garden.
The security minister said that their murder was broadcast to a closed group of 45 people, with a voice heard during the livestream saying, this is what happens to those who steal drugs from me.
Following the crime, Argentine police arrested seven suspects, including the man believed to have dug the hole for the victims and those who drove them to the house.
However, the primary suspect, 20-year-old Tony Janzen Valverde Victoriano, also known as Little J, managed to evade capture until now.
He was detained by police on a motorway 70km (43 miles) south of the Peruvian capital, Lima, hidden in a van transporting fish.
In a separate operation, Peruvian police also detained a 28-year-old Argentine man, Matías Ozorio, who they say is Valverde’s right-hand man.
Ozorio will soon be handed over to Argentine authorities, while Valverde will remain in custody in Peru pending an extradition request from Argentina.
Peruvian police have intercepted communications between Valverde and Ozorio, facilitating their tracking.
Ozorio claimed he was tricked by a drug gang he owed money to into entering Peru.
Argentina's security minister commended the Peruvian police for their assistance in apprehending the two suspects.
