South Korean authorities have raided the offices of Samsung and the national pension fund as part of a corruption investigation linked to the president.
They are probing whether Park Geun-hye pressured the fund to support a Samsung merger, said the Yonhap news agency.
In return, Samsung is alleged to have given financial favours to Ms Park’s confidante Choi Soon-sil, Yonhap said.
The scandal has led to growing calls for Ms Park’s resignation, but she has said the allegations are “fantasy”.
Ms Choi, who has been charged with coercion and attempted fraud, is accused of using her close relationship with Ms Park to obtain favours and funds for her own gain.
Earlier this week prosecutors said Ms Park had a “considerable” role in the scandal.
The allegations have enraged the South Korean public, and caused Ms Park’s approval ratings to plummet. However, she has resisted the calls for her to resign and has yet to agree …
READ MORE ON BBC.CO.UK