North Korea has called a February raid on its embassy in Spain by a shadowy anti-regime group "a grave terrorist attack," state-run media said Sunday in Pyongyang's first reaction to the break-in.

A spokesperson for the North's Foreign Ministry labeled the raid "an illegal intrusion into and occupation of a diplomatic mission and act of extortion," the official Korean Central News Agency (KCNA) reported, with the spokesman calling it "a grave breach of state sovereignty and a flagrant violation of international law."

The raid saw a group of reportedly armed men break into the Madrid embassy compound, allegedly roughing up employees and stealing computers and key documents.