The Prime Minister said his "thoughts and prayers" are with MP Paul Goggins and his family after he collapsed during a run with his son.
David Cameron said: "My thoughts and prayers, like those of MPs across Parliament, are with Paul Goggins MP and his family following the sad news that he has been taken seriously ill."
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German news agency dpa reported that prosecutors decided to seek Mr Stadler’s arrest due to fears he might try to evade justice.
David Dimbleby is stepping down after 25 years presenting the BBC show.
British Transport Police (BTP) were called to Loughborough Junction station in south London at 7.30am on Monday.