The National Police Agency on Tuesday raided two regional police agencies to look into allegations that they systematically posted online comments supporting government policies during the Lee Myung-bak administration. 

The national agency sent some 20 investigators to the Seoul Metropolitan Police Agency and the Gyeonggi Nambu Provincial Police Agency at around 9 a.m. 

The raids came after evidence was secured that some officers of the two regional agencies' public security departments were involved in posting the online comments. 

The public security department is charged with probing cases involving violations of the National Security Law and issues regarding North Korean defectors.