Who are the suspects behind the London terror attack?

The Telegraph reports http://www.telegraph.co.uk/news/0/suspects-behind-london-terrorist-attack/ something that I have not seen reported by the BBC...

'One eyewitness spoke of the men shouting "this is for Allah" as they stabbed indiscriminately.'

Now why would the BBC not report that?

Presumably the BBC will report that this attack is because of British intervention in Iraq, Afghanistan, Libya etc. With the subtext that there will be more of these attacks unless we elect Jeremy Corbyn as Prime Minister, as he has made just this point.

Prime Minister Jeremy 'friend of Hamas, Hezbollah and associate of IRA members' Corbyn, heaven help the country.