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LONDON, England (CNN) -- Emergency services personnel are attending three different Tube stations in central London following reports of "incidents," police said on Thursday.
A Scotland Yard spokesperson told CNN that Warren Street, Shepherds Bush and Oval stations had all been evacuated.
There are no reports of any casualties at this stage, sources told the UK Press Association.
London Underground confirmed that services on three lines -- Victoria, Northern and Hammermith and City -- were suspended following the incidents, according to PA.
No further information is yet available. Passengers at Warren Street reported seeing smoke but police could not confirm this.
One Victoria Line passenger said a traveler's rucksack exploded on the Tube outside Warren Street station.
Ivan McCracken told Sky News: "I was in a middle carriage and the train was not far short of Warren Street station when suddenly the door between my carriage and the next one burst open and dozens of people started rushing through. Some were falling, there was mass panic.
"It was difficult to get the story from any of them what had happened but when I got to ground level there was an Italian young man comforting an Italian girl who told me he had seen what had happened.
"He said a man was carrying a rucksack and the rucksack suddenly exploded. It was a minor explosion but enough to blow open the rucksack.
A Scotland Yard spokesperson told CNN that Warren Street, Shepherds Bush and Oval stations had all been evacuated.
There are no reports of any casualties at this stage, sources told the UK Press Association.
London Underground confirmed that services on three lines -- Victoria, Northern and Hammermith and City -- were suspended following the incidents, according to PA.
No further information is yet available. Passengers at Warren Street reported seeing smoke but police could not confirm this.
One Victoria Line passenger said a traveler's rucksack exploded on the Tube outside Warren Street station.
Ivan McCracken told Sky News: "I was in a middle carriage and the train was not far short of Warren Street station when suddenly the door between my carriage and the next one burst open and dozens of people started rushing through. Some were falling, there was mass panic.
"It was difficult to get the story from any of them what had happened but when I got to ground level there was an Italian young man comforting an Italian girl who told me he had seen what had happened.
"He said a man was carrying a rucksack and the rucksack suddenly exploded. It was a minor explosion but enough to blow open the rucksack.