CNN reporter Saskya Vandoorne has tweeted that Michael Schumacher's family will be updated on his condition at 8.30 GMT:
#schumacher's hospital tells me briefing between family,manager+doctors at 9.30local.After which may be presser,statement or communique
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A suspected gunman held people hostage inside the store, police said.
Popular channels including Dave and Gold disappeared from sets after a business dispute went unresolved.
Police said it was not clear whether anyone was still inside the store.