Prosecutors raided local advertisement companies Thursday over allegations that they gave illegal kickbacks to a minor opposition party lawmaker during the parliamentary elections held in April.

The Seoul Western District Prosecutors' Office raided about six offices over suspicions that Rep. Kim Su-min of the People's Party illegally received some 178 million won ($154,000) from the firms through forged contracts.

Kim was in charge of the party's election campaign ahead of the April 13 general elections.

Prosecutors said the 29-year-old lawmaker's office and the party's headquarters were not included on the raid.

The legal action came shortly after the National Election Commission announced that it filed a complaint with state prosecution, seeking a probe into the alleged irregularities. (Yonhap)