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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.

"The man then made an exclamation as if something had gone wrong. At that point everyone rushed from the carriage."

The reports came two weeks to the day since bombs on three Underground trains in London and a double-decker bus killed 56 people including four bombers.

Emergency services have been called to three Tube stations after "incidents", Scotland Yard said.
Police confirmed they had been called to Warren Street, Oval and Shepherd's Bush stations.

There have been reports of smoke coming from two of the stations and all three have been evacuated.

The whole of the Northern Line has been suspended, along with the Victoria Line and the Hammersmith and City. There are no reports of any casualties.

Police also confirmed that emergency service personnel have responded to reports of an incident on a route 26 bus in Hackney Road.

A spokesman for London Underground said the nature of the incidents was unknown.

One hospital, near Warren St station, has started its emergency plan.

Sosiane Mohellavi, 35, was travelling from Oxford Circus to Walthamstow when she was evacuated from a train at Warren Street.

"I was in the carriage and we smelt smoke - it was like something was burning.

"Everyone was panicked and people were screaming. We had to pull the alarm. I am still shaking."

But a BBC reporter outside Warren St station said there was no sign of smoke outside.