LONDON  - The BBC announced that two of its executives were standing aside on Monday and warned more heads may roll as it battles with a major crisis over its reporting of abuse that toppled the director-general. The broadcaster also came under fresh pressure after it emerged that George Entwistle, who dramatically quit as director-general on Saturday, would receive a payoff of £450,000 ($715,000) after just 54 days in the job. Prime Minister David Cameron reportedly said the payment was “hard to justify”, increasing the pressure on Chris Patten, the chairman of the BBC’s governing board the BBC Trust, who is himself fending off calls to quit.