The BBC brings home the shocking reality behind the weekend’s revelations...
Met Police chief Sir Ian Blair has apologised to the family of the Brazilian man shot dead by police in south London on Friday.
He said the death of Jean Charles de Menezes was a "tragedy", but admitted more people could be shot as police hunt suspected suicide bombers.
The 27-year-old electrician's family condemned the shooting and said there was no reason to suspect him.
Meanwhile a third man has been arrested by police under the Terrorism Act. Police said on Sunday that the man was arrested in Tulse Hill, south London, on Saturday evening. He is the third man to be questioned under the Terrorism Act.
Home Secretary Charles Clarke described the shooting of Mr Menezes as an "absolute tragedy".
Mr Menezes, who lived in Tulse Hill, was completely unconnected to Thursday's attempted bombings, Scotland Yard has confirmed.
The one thing I have to commend The Metropolitan Police for is holding their hands up immediately for this tragic error and not trying to cover it up.
That being said, is this REALLY the policy we want to put an end to terrorism?
This man was a suspect because he was supposedly “seen emerging from a block of flats that was under surveillance”.
Let’s face it – his having dark skin did not help. Does this mean my Portuguese heritage makes me a target should I happen to find myself in the wrong place at the wrong time?
I cannot even begin to imagine what the police officers said to him on their first approach that made him start to run.
What the terrorists want is to be known as terrorists. I say we downgrade them to anarchists and stop providing them with proof that we are willing to live in a permanent state of terror.
Oh yeah, and doing whatever it takes to be sure more innocent people aren’t shot dead by the good guys would be nice too.