Judy Murray, captain of the Aegon GB Fed Cup Team has said former tennis British number one Elena Baltacha remains 'determined and upbeat'.
Judy said: "Obviously this is a tough time for Bally, Nino and her family but she is a such a determined, upbeat person and everyone around her is staying positive as well. I know she'll be really grateful for all the support that she's getting."
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.