Following calls to tackle hate speech at universities, Business Secretary Vince Cable said there was a "very difficult balance to strike" between protecting free speech and stopping extremists inciting violence.
Speaking at an event in central London, Mr Cable said: "We have recognised that there are extremists on university campuses. We have got a strategy which we are developing with the university authorities to deal with it.
But it's obviously a very difficult balance to strike between freedom of speech, which is absolutely fundamental to our value system as a country, and stopping incitement to violence.
Getting that balance right is very tricky."
Documents suggest Security Services were trying to recruit Woolwich suspect Michael Adebolajo and had also approached members of his family.
Police will today question one of the men suspected of murdering Drummer Lee Rigby in Woolwich, a week after the soldier's death.
After a three day search, I found the home of the grandmother of Michael Adebowale, one of the suspected killers of Drummer Lee Rigby.