A Mexican citizen living in the US was the alleged ringleader of an assault on the North Korean embassy in Madrid after which he handed over the audiovisual material he allegedly stole to the FBI in New York, Spanish judicial authorities said on Tuesday.

Judge José María de la Mata agreed on Tuesday to share the details of a case opened in a Spanish National Court investigating the forced entry into the North Korean embassy in the Spanish capital and theft of computers on February 22.

The investigation, which up until now had remained undisclosed, gave details of a series of alleged crimes, including burglary, forced entry, false imprisonment, injuries, forgery of documents, threats of violence and theft committed by a criminal organization

The alleged ringleader, the judge said, arrived at the embassy in the afternoon on Feb. 22 and asked to see the head of business, whom he already knew from a previous visit during which he passed himself off as an entrepreneur.

Shortly after, according to the account, 10 people burst into the building with machetes, knives, iron bars and handguns.

"They started to violently hit the occupants of the building until they were able to restrain them and placed shackles and cable ties on them," the judicial account added.

The embassy is located in the Moncloa-Aravaca district of Madrid near Spain's National Intelligence Center (CNI).

According to EFE sources close to the investigation, no complaints had been made by the North Korean's diplomatic mission following the assault.

A spokesperson for the North Korean embassy told EFE that "nothing had happened."

Police said a woman was injured and treated in a street close to the embassy building a couple of hours after the assault.

Madrid emergency services told EFE they had treated three people for light bruises.

The embassy was opened in Oct. 2013 by Kim Hyok-Chol, a diplomat who was expelled from Spain on Sept. 25, 2017, due to North Korea's testing of ballistic missiles.

The North Korean embassy in Madrid has been reduced to a minimum, with a head of business and a small group of architecture students.