Terrorists' families should be jailed if they fail to alert authorities, says Government's top terror adviser

“We’ve done research that shows that in more than half of cases of ‘lone wolves’, individuals have told someone or clearly telegraphed that intent, usually to family members,” Mr Pantucci told The Independent. “But it can be difficult to tell statements indicating an attack is being planned from their normal patterns of behaviour. Some people don’t realise what they’re seeing. What may seem innocuous can turn into a problem.”