The Behavioral Science Unit (BSU) helps Britain’s security agency MI5 to get into to the minds of the terrorists. So far, it has prevented seven terrorist attacks from occurring. The BSU is situated at Thames House, headquarters of the security agency.

At BSU, investigators look for clues to find evidence of changing behavior. The team comprises of criminologists, psychologists, anthropologists and academics. The team determines whether those suspected to be threat for public are talkers or walkers. Talkers are who just talk about doing something, while walkers are those who make plans to attack.

MI5 researchers found that over 60% of those preparing to attack provide clues about their plans that lead them caught. Neil, an Arabic and Norwegian speaker, who has worked for the unit for six years, said that their work involves probability. They report the information collected through the clues to the investigating officers who decide what should be done with clues further.

"The BSU then looks for signs of unusual activity, such as an increasing sense of grievance, a desire to acquire skills and tactics. An attempt to identify material for their plans and logistical practice and trial runs", said Neil. The team of officers is assessed for its ability by officers.

To get some clues from the certain suspect, the BSU team keeps monitoring a person closely to know his intention. The team uses surveillance logs, records of online activity or tips from the public about suspicious activity source for their clues.

Those suspected to develop intent, capability and plan and prepare for their act. Some can proceed with their plans very quickly with their plans, while others may take years. The BSU was created in 2004. The members are twice in number since murder of Fusilier Lee Rigby in 2013 by Michael Adebolajo and Michael Adebowale, two Muslim converts.

According to a report in The Sun by JAKE RYAN, "They are made up of criminologists, psychologists and other academics who work in the intelligence service’s London HQ. Research by MI5 shows more than 60 per cent of lone wolf attackers provide clues they are about to strike with their changing behaviour."

The experts then search for signs of unusual activity such as “increasing sense of grievance, a desire to acquire skills and tactics – an attempt to identify material for their plans and logistical practice and trial runs”.

A report had shown Muslim converts Michael Adebolajo and Michael Adebowale displayed subtle signs of becoming more radical in the lead up to the attack. And in 2010 Roshonara Choudhry, who stabbed the MP Stephen Timms, quit her college course, cleared out her bank accounts and settled her student loan over fears her parents would be passed the debt.

A report published in The Australian revealed, "The Sunday Times was granted unprecedented access last week to some of the staff who work at the Behavioural Science Unit at Thames House, the headquarters of MI5 on the north bank of the River Thames in London."

Research by MI5 shows that more than 60 per cent of so-called lone wolves unwittingly provide clues that they are preparing to strike. The BSU’s work involves picking up signs of such changing behaviour.

His team is passed intelligence by officers that is gleaned from a network of informants and the public. The BSU then looks for signs of unusual activity, such as an “increasing sense of grievance, a desire to acquire skills and tactics ... an attempt to identify material for their plans and logistical practice and trial runs”.