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Facing reporters alone at a press conference at the Hong Kong Club, Mr Tien said he had tendered his resignation to Mr Tsang on Saturday morning and had left it to Mr Tsang to decide when he should step down.
The board of the KCRC will hold an emergency meeting today in a bid to find a solution to the dispute between the corporation's chairman and acting chief executive.
The changes at the top came only a day after a feud between Mr Lai and KCRC chairman Michael Tien Puk-sun appeared to have been resolved.
Announcing his resignation to the media yesterday, Samuel Lai said: 'I volunteered the resignation without pressure from anybody. I feel like I should bear sole responsibility for my colleagues' mistakes, and be accountable for all the adverse impact their action has brought upon the company.'
More evidence emerged yesterday of security breaches making personal particulars available on the internet, as police chiefs scrambled to plug a loophole that allowed private details of complainants against the police to be leaked.