There have been unconfirmed reports of an apparently minor explosion on the London Underground.There are no reports of casualties.A series of incidents have been reported near Warren Street, Oval and Shepherd's Bush stations on the London Underground.
The stations have been evacuated.
Train passenger Ivan McCracken told Sky News he spoke to an Italian man who witnessed an explosion.
"He told me he had seen a man carrying a rucksack which suddenly exploded. It was a minor explosion but enough to blow open his rucksack. Everyone rushed from the carriage. People evacuated very quickly. There was no panic.
"I didn't see anyone injured but there was shock and fright.
"There was a smell of smoke."
"The man who was holding the rucksack looked extremely dismayed.
Police have cordoned off the streets around Warren Street station. They said a suspect package had been reported on a Victoria Line train.
Sky reporter Mark White said authorities are "pushing everybody as far back from the station as they can".
It is two weeks to the day since bombers attacked three Tube trains and a bus in central London.
Another eyewitness, Sosiane Mohellavi, said "Everyone panicked and people were screaming.
"We had to pull the alarm. I am still shaking."
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