London attacks

NEW TWIST: MI5 Known Wolf Attacker Khalid Masood ‘No Extremist Tendencies’ & No Link to Terror

21st Century Wire says…
According to London’s counter-terrorism unit, Khalid Masood the man named in the Westminster Bridge and Parliament Square attacks has no ties to terror and “no extremist tendencies.”
QUESTION: If the English teaching Masood didn’t have ties to ISIS or al-Qaeda and wasn’t believed to have extremist tendencies – then why did British security services take a keen interest in him as they had previously declared?