A former U.S. Marine accused of stealing electronics from the North Korean Embassy in Madrid in a robbery of the diplomatic compound was ordered by a federal judge in Los Angeles on Tuesday to remain in U.S. custody pending possible extradition to Spain.

The judge also ordered the unsealing of U.S. court documents in the case against Christopher Philip Ahn, 38, who was arrested by federal agents in Los Angeles on Thursday.

Spanish authorities have sought Ahn's extradition from the United States. He is charged there with being among a group of seven intruders who stormed the North Korean mission on Feb. 22, restrained and physically beat some embassy personnel, held them hostage for hours and then fled.