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London Air Ambulance confirmed a doctor and a paramedic were sent to the scene at 14.27pm and are on site.
London Ambulance Service was also called to the scene.
Further details regarding casualties were not yet available.
Emmerdale star Adele Silva has paid tribute to co-star Richard Thorp, who has died aged 81.
Adele, who plays Kelly Windsor in the soap, said on Twitter: "RIP - lovely man & coolest guy I've seen with a harley!"
Ah sad news to hear about Richard Thorpe RIP - lovely man & coolest guy I've seen with a harley!From @silvalining_AS on Twitter:
Police are dealing with a "serious incident" after responding to reports of an assault.
Officers were called to John Wilson Street in Woolwich, south east London, at around 2.20pm today and the immediate area was shut down.
A Scotland Yard spokesman said: "Officers have responded to an incident in John Wilson Street at 2.20pm today.
"We believe at this stage officers were called to reports of an assault."
Twitter user @M_ATLEY shared this picture of a police helicopter arriving on the scene in Woolwich.
Sue Hemming, Head of Special Crime and Counter Terrorism at the CPS, explains a man has been charged with the murders of four soldiers in the IRA's 1982 Hyde Park bombing:
Police have been called to reports of an assault in Woolwich, south London.
Police helicopters said they had been called to deal with a "serious incident".
US Secretary of State John Kerry has said there are several thousand Hezbollah fighters on the ground in Syria.
Kerry condemned Hezbollah involvement in the crisis in Syria.
He added that Syrian opposition will get more support if President Assad does not come to peace talks.
The FBI said a man shot dead in Florida today had become violent during questioning related to the Boston Marathon bombing.
The man, identified as Ibragim Todashev, was fatally shot by an FBI agent in Orlando, Florida, when he initiated a violent confrontation, an FBI statement said.
Google boss Eric Schmidt has said law would have to change before the company would consider altering its tax arrangements.
He said the firm would continue to invest in the UK no matter what, adding that Google was proud of its profits, without which there would be a "cost".
Mr Schmidt said: "[Google] makes profits and we're proud of it... less profits has a cost."...the law will have to change for Google to change its tax arrangements."
When he was asked if the current set up was "unethical", he replied: "No."
The Googe boss said the UK was "too important" for the firm."
We will continue to invest in Britain no matter what," he added.
Mark Bridger has told the court: "The only other recollection I have is holding April in my arms and laying her down on the carpet (in the living room)."
The judge asked Bridger to clarify when he had had this recollection. He said in the last couple of months it had come to him.