8:26 am: Just breaking, trying to get some info.

Sky News:

There have been unconfirmed reports of an apparently minor explosion on the London Underground. A series of incidents have been reported near Warren Street, Oval and Shepherd's Bush stations on the London Underground.

Fox is reporting that a building have been evactuated and smoke is coming from undeground.

BBC:

The whole of the Northern Line has been suspended, along with the Victoria Line and the Hammersmith and City. One hospital has begun its emergency plan.

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

There are no reports of any casualties.

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

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.

FOX tv is reporting that Scotland Yard said there was an "incident" on a bus - Hackney Road bus.

BBC has confirmed the bus incident.

BBC now reporting detonators only, no explosions.

People have been talking about shooting, but sources believe they mistook the sounds of the detonators for gunshots.

Also, any reports of nailbombs - and there have been several - have been denied.

From a reader in the comments:

Email from a friend in Shepherd's Bush,

"I had just got on the train at Sheperds Bush (H&C Line) when it all kicked off there.

Didn't here a bang, people were calm, aussie bloke said "fuck this, more explosives!" and pegged it.

Out of the station and a woman told me a guy in the last carriage was laid on his back, that his backpack had exploded and everyone had come into her carriage crying..."

Ok, now Reuters is reporting that the nail bomb story is true.

Update: No casualties on bus, which seems to have been evacauated before the "incident," and one injury at Warren Street.

This is looking very much like a planned bombing that didn't quite go off.

Guardian

A British Transport Police spokesman said: "One person has received an injury at Warren Street. "We cannot confirm what the injury is, how it was received or who serious it is. We are still waiting for more information."

FOX:

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.

From Rich, in the comments:

Queens college hospital is being sealed of by armed police, the injured person may be one of the would be bombers.

Update 9:20

SKY:

Sky News Foreign Affairs editor Tim Marshall said: "There is a bus parked there which is empty and there is nobody anywhere near it. This does indicate that police think the bus is still dangerous."

Sky News Online's Rob Cole is at Shepherd's Bush. He said: "The whole of Shepherd's Bush Green is sealed off. About 400 metres on both sides of the Tube station is affected."

Network Rail say all mainline train services are running from London stations.

Reports of HazMat teams on the site now.

Just got a report that CNN is reporting one person dead - will check on that.

Here's that nail bomb confirm by Reuters.

Update: the death seems to be a rumor but there is one definite injured person. Also, FOX tv reporting that a chase of a suspect and arrest has ensued....will look for link on that.

9:45:

London police have confirmed four explosions.(via Fox headline)

From TCP contributor Andrew:

The police are saying its not a "major incident" yet...it seems its become "major" now. UCL Hospital has been cordoned off by police. Mobile network has been cut off and tube network is shut down. Bombs seem to be smaller than last time but they are not sure what is going on. People are being told to stay where we are.

Update 10:00

Reports that this has been upgraded to a MAJOR incident.

BBC confirms reports of armed men entering University College Hospital.

All signs point to the injured person being one of the terrorists.

A Flckr photoset from Warren St. today

Blair speaking in a few moments...

Reports of an arrest being made...

Incident map

Pictures here

Police in chemical protection suits were seen preparing to enter the Warren Street station. Sky News reported that police said no chemical agents were involved in the explosions. There was also an incident at 10 Downing Street, where British Prime Minister Tony Blair's offices are located. Two police officers trained their guns on a man before leading him off the premises; his shirt was unbuttoned in the front.

11:00

SKY: An internal memo to staff at the hospital has warned them to be on the lookout for a black male, possibly of Asian origin, about 6ft 2ins tall, wearing a blue top with wires protruding from the rear of the top.

"We can't minimizes incidents such as this … we know why these things are done -- they're done to scare people, to frighten, to make them anxious and worried," British Prime Minister Tony Blair said during a press conference with Australian Prime Minister John Howard, who was in London for a meeting with his British counterpart.

Blair added that he has spoken with Metropolitan police ommissioner and that, "his hope is that things can now get back to normal again as quickly as possible."

"I think we've just got to react calmly and continue with our business as much as possible as normal," the prime minister added.

Blair also thanked Howard for Australia's support in the War on Terrorism (search), particularly after the July 7 bombings in the United Kingdom, which took the life of one Australian.

"This scourge of terrorism is one that we all face together," Blair said.

"Terrorism is the enemy of all free people," added Howard.

One thing is clear about this afternoon's events: the bombers and bomb makers were very different from the suicide bombers whose attacks exactly two weeks ago killed more than 50 people.

First indications suggested those responsible for today’s attacks were "amateurs" and their bombs were crude. There is a report for example, that one of the devices was a nail bomb.

[...]

But so many questions remain. Were they copy-cat bombers? Were the targets chosen in the form of the four points of the compass - north, south, east, west, like the July 7 bombs were supposed to be?

11:37

FOX reporting that the explosives are the same type used in the July 7th attacks.

No trace of chemical agents

BBC reporter's log

What happened on the Number 26 Bus

In regards the the "Asian" description of the suspect, please read this comment.

Blogs:

Andrew Ian Dodge has more from London
Also, Blogs of War has updates

More updates (and speculation) at Wizbang, including links to other blogs.

Guardian blog