Three London Underground stations were evacuated at midday Thursday following reports of incidents, British Transport Police said. The Fire Brigade was investigating a report of smoke at one station. Emergency services personnel were also responding to some sort of incident on a bus in the Hackney neighborhood. A London Underground spokesman said there were no reports of casualties in the incidents. The Warren Street, Shepherds Bush and Oval stations were evacuated. Emergency services personnel were called to the stations, police said. There were reports of a nail bomb that exploded at Warren Street but those reports have not yet been confirmed. Some witnesses said they heard gunshots at the Warren Street stop but according to Sky News, police believe those noises were actually detonators going off for bombs that didn't explode. "People were panicking. But very fortunately the train was only 15 seconds from the station," witness Ivan McCracken told Sky News. McCracken said he smelled smoke, and people were panicking and coming into his carriage. He said he spoke to an Italian man who was comforting a woman after the evacuation. "He said that a man was carrying a rucksack and the rucksack suddenly exploded. It was a minor explosion but enough to blow open the rucksack," McCracken said. "The man then made an exclamation as if something had gone wrong. At that point everyone rushed from the carriage." Services on the Victoria and Northern lines were suspended following reports of a number of incidents, the London Underground said. "I was in the carriage and we smelled smoke -- it was like something was burning," said Losiane Mohellavi, 35, who was evacuated at Warren Street. "Everyone was panicked and people were screaming. We had to pull the alarm. I am still shaking." The reports came exactly two weeks to the day that four homicide bombers attacked three subway stations and a double-decker bus in London, killing 52 others. Simon Marks, president and chief correspondent for Feature Story News, was reporting from the Warren Street Underground station for FOX News. He said the area was cordoned off as dozens of fire trucks and emergency vehicles were arriving. "I think this looks like much more than a false alarm at this point," Marks told FOX News. http://www.foxnews.com/story/0,2933,163186,00.html -- But other sources are reporting injuries from nail bombs, etc.