A day after a court hearing that was shrouded in secrecy, a Danish court has jailed another person until Feb. 9 in a case believed to be linked to the first suspect, reportedly a 15-year-old girl with Muslim extremist sympathies.

Friday's hearing in Holbaek, 65 kilometers (40 miles) west of Copenhagen, also was held behind double closed doors, which means that no information can be made public. That is customary in terror-related cases in Denmark.

Local media say the new suspect was man who had been in Syria. Police in eastern Denmark confirmed that a person had been arrested Thursday but declined to disclose details, citing the investigation.

Danish media said the teenager was a Danish girl who recently converted to Islam. She was jailed Thursday until Feb. 9.