The director of a leading thinktank which combats terrorism has said we have to accept the reality attacks like Parsons Green will happen more often unless the key ideas behind them are repelled.
Two men have been arrested on suspicion of being involved in the Parsons Green Bombing.
One of them has been named as 21-year-old Syrian refugee Yahya Faroukh, who was arrested in Hounslow. The other has been reported to be an 18-year-old from Iraq.
Islamic State claimed responsibility for the incident over the weekend.
Adam Deen, the executive director at the Quilliam Foundation, said attacks like this had to be accepted as "part-and-parcel" of daily life, but explained his belief in a potential solution.
He told Julia Hartley-Brewer: "Isis will claim responsibility for an accident in the kitchen if they could, it’s irrelevant if they’ve instructed or inspired.
"Unfortunately, and this may upset your listeners, we have to accept the reality more attacks of this nature will happen.
"The challenge we have is evident – the message they are putting out seems to be reaching far and wide.
"The key is – I want to understand what makes an individual decide to do this. Why would an individual decide to take it on himself to commit an act of terrorism?
"We need to get to these vulnerable people who are exploited by the likes of Islamic State. If we get to them first, we can stop them from carrying out these attacks."