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
Some four million Brits are expected to fly out of the UK over the festive period, along with many more using roads and railways.
Scientists believe they may have found the key to fighting HIV - and it rests in the immune system of llamas.
The United Nations has made a renewed and record-breaking global appeal, after falling well short of its last request for financial help.