Asked when was the mail received by the BWF, Thomas said: 'I am not exactly sure but most probably it was after they left.'
'We cannot convince anyone to stay here, we are just sharing information from reliable sources,' he said.
Asked whether security will be beefed up in view of Independence day, Thomas said: 'Normal security measures are in place right from the start of the tournament. We have asked the players not to go to any public place if there are any worries.'
Thomas, however, said the two Austrian players would not face any punitive action or fine.
'The circumstances are different after the terror threat report. They will have to pay the withdrawal money, but there is no provision of any fine.'
Thomas also said India as a hosts should not be blamed for it.
'I do not think that the host organisation should be blamed here. The security arrangements are adequate,' said Thomas while adding they are relieved that the test results of the Malaysian coach for swine flu has come negative.
'However the precautionary health measures at the venue and the hotels will continue,' he said.
--Indo-Asian News service
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