Communities Secretary Eric Pickles has told Daybreak there is "always a risk that extremists will do stupid and unpleasant things."
He said the Woolwich attack has "actually been a catalyst to bring communities together":
More top news
The driver of a lorry that crashed killing six people had "satisfactory" references from his previous employer despite a written warning.
We were granted rare access to the Ku Klux Klan, meeting a group fuelled by ritual and vitriol.
The Government said Judge Munby's plan to tag adults thought to be at risk of joining Islamic State was "novel".