Spanish police have arrested the alleged leader of a Colombian organized crime outfit that is accused of smuggling cocaine and at least 400 murders, according to a report from The Telegraph.

Hernan Alonso Villa, also known as The Mouse, was detained Friday in the Spanish city of Alicante, police said. Villa is believed to be a leader of a cocaine smuggling operation called Oficina de Envigado.

The Oficina is said to trace its roots to violence associated with the infamous Medellin Cartel in the 1980s. Insight Crime claimed that the Oficina makes about $31 million per year laundering money.

Villa is thought to be "the top leader of the military wing of the Oficina de Envigado, a Colombian criminal organization accused of 400 killings as well as drug trafficking, extortion and forced displacements of Colombian citizens," the police statement said.

The police detained Villa under a Colombian extradition warrant that carried charges of homicide and arms offenses. When the police caught him, he was carrying 40,000 euros in cash.

"He is one of the criminals most wanted by the Colombian authorities," Spanish police said. "He had more than 200 people under his command and was responsible for exporting cocaine to Spain, the United States and Holland."

The UN claims that Spain is the leading cocaine consumer in Europe, which itself uses about 25 percent of the world's cocaine, according to the Guardian. Spain is also the gateway to Europe for South American cocaine.

In 2013, Spanish authorities seized 26.5 tons of cocaine, up 27 percent from the amount seized in 2012.

"(The Mouse) was arrested thanks to the work of our people and the Spanish authorities," said Rodolfo Palomino, Colombia's police chief. "Villa committed serious crimes in Medellin, in particular murders, disappearances, extortions and kidnappings. He then went to Europe seeking to continue his activities in durg dealing and coordinating trafficking routes."