Marcelo Pecci, a Paraguayan anti-drug prosecutor, was shot dead on his honeymoon on a Colombian Caribbean island on Tuesday, in what police called a “murder.”

Five homicide investigators have been dispatched to the island of Baru, near Cartagena, with the assistance of experts from Paraguay and the United States, according to Colombian police chief Jorge Luis Vargas.

Pecci married journalist Claudia Aguilera in Cartagena on April 30, according to her Twitter account.

She told W Radio that “two men arrived on a boat, approached, and shot” Vargas before fleeing.

“A guard tried to get closer but they also shot the guard,” she recounted.

Aguilera said the prosecutor had not received any threats.

“The entire Paraguayan nation mourns the cowardly murder of prosecutor Marcelo Pecci in Colombia,” Paraguay’s President Mario Abdo Benitez said on Twitter.

“We condemn this tragic event in the strongest terms, and we redouble our commitment to fighting organized crime,” he added.

Colombia is the world’s largest producer of cocaine in the world.

The country is in the grips of a wave of violence despite a 2016 peace deal that disarmed the FARC guerrilla group and ended a near six-decade civil conflict.

Fighting over territory and resources continues between dissident FARC guerrillas, the ELN rebel group, paramilitary forces and drug cartels.

Paraguay, for its part, has become an important transit point for drugs destined for Europe.

Benitez fired his interior minister in February after a newspaper report accused him of using the armoured vehicle of a suspected drug dealer while on vacation in Brazil.