Three top executives at South Korea's biggest conglomerate  Samsung stepped down Tuesday after they were indicted on charges including bribery and embezzlement.

The resignations did not include Lee Jae-Yong, vice chairman of group flagship Samsung Electronics, the world's biggest smartphone maker.

Samsung was also "dismantling" its Future Strategy Office, the co-ordinating body that guides the conglomerate, the group said in a statement announcing the resignations.