Seoul : A South Korean independent counsel team investigating a scandal involving impeached President Park Geun-hye on Monday summoned two key Samsung Group executives on bribery charges.

Choi Ji-sung, head of Samsung Group's future strategy office, appeared in the special prosecutor office in Seoul, Xinhua news agency reported.

His deputy, Chang Choong-ki, was also summoned.

Although the duo were summoned as reference witnesses, but they could be tried as criminal suspects after interrogation, a statement released by the prosecutor's office said.-Agency