The National Security Service of the Democratic People's Republic of Korea (DPRK) announced on Wednesday it had arrested a number of foreign spies and native citizens working for a foreign intelligence service.

Li Su Gil, a spokesman of the DPRK National Security Service, said at a press conference that the alleged spies "collected official documents and the information of DPRK important military facilities, and spread the idea of so-called democracy and freedom to the people."

"We arrested those spies when they were busying transmitting information on the spot, and they will be brought to justice under DPRK law," said the spokesman.

"They carried out the missions by means of diverse espionage equipment, from digital cameras and pinhole cameras to GPS," said Li.

During the press conference, the camera footage appeared to show the captured spy equipment, including a fake rock containing a satellite communications gadget, a bug in a flowerpot and all kinds of espionage cameras.

The spokesman didn't release the number and nationality of the foreign spies or when and where the security force arrested them and the native citizens working for a foreign intelligence service.

"Now the situation on the Korean Peninsula seems to be easing up on the surface, but in fact hostile forces are intensifying their espionage against the DPRK," said Li.

"The goal of hostile forces is to start a psychological war against the DPRK and overthrow socialism and the regime in our country. The people and security service will remain on high alert for this," he said.