The special prosecutors who are investigating alleged corruption at Samsung Group questioned its vice chairman amid intensifying speculation that the conglomerate's boss could be called soon, an Associated Press report said.
'I faithfully answered in response to the various things they asked,' Lee Hak-soo, Samsung's second most senior executive, was quoted as saying in footage as he emerged from questioning at the special prosecutor's office.
Kim In-joo, a top official in Samsung's strategic planning office, was also questioned.
The special probe was approved by the National Assembly and former President Roh Moo-hyun, whose five-year term ended last week.
The summoning of the executives came a day after Lee Jae-yong, an executive at Samsung Electronics and son of Samsung Chairman Lee Kun-hee, spent 14 hours with investigators, the report said. Samsung Electronics is the group's flagship company.
An independent counsel has been looking into alleged wrongdoing at Samsung since last month after a former top attorney for the conglomerate spoke out late last year.
Kim Yong-chul claimed the conglomerate created a US$213 million/â‚¬140.2 million/Â£107.5 million slush fund with which to bribe government officials, judges and prosecutors and buy works of art.
Samsung has denied the allegations.