This photo, provided by a civic group opposed to the deployment of the Terminal High Altitude Area Defense U.S. missile defense system, shows the group's tent in the county of Seongju, 215 kilometers southeast of Seoul, raided by prosecutors, Jan. 9. Yonhap

Prosecutors on Thursday raided the home of a former deputy national security chief, as part of their probe into suspicions of leaking intelligence related to a U.S. missile defense system to delay the formal deployment of the Terminal High Altitude Area Defense (THAAD) battery.

Suh Choo-suk, former first deputy director of the National Security Office under the Moon Jae-in administration, is one of four high-ranking security officials who have been accused of allegedly leaking THAAD-related intelligence to activists.

Suh, former National Security Adviser Chung Eui-yong and two other senior officials who served in the preceding government are accused of allegedly attempting to delay the official deployment of the THAAD battery in the county by mandating an environmental evaluation, which takes over a year to complete, while delaying the vetting process.

They are also accused of leaking the plans by U.S. and Korean forces to replace a THAAD battery missile to activists and China. (Yonhap)