How to stop homegrown terrorists before they strike

Manchester suicide bomber Salman Abedi was on the radar of British authorities as a Muslim extremist, but they failed to stop him before he massacred girls at a pop concert. It’s a recurring problem on both sides of the pond. US authorities also keep missing “known wolves” who were under suspicion before they attacked.

This was true of the Chelsea bomber and the Orlando nightclub shooter and one of the Boston bombers before him. Cases were opened and then, tragically, closed.

In fact, according to terrorism analyst Patrick Poole, at least 12 of the 14 Islamic terrorists who carried out attacks in the US during the Obama years had been previously investigated on extremism fears.