Terror strikes on three continents, can others be stopped?

Aired: 6/26/2015 | 0:05:21 | Clip
Three deadly attacks in France, Kuwait and Tunisia came just days after Islamic State militants urged followers to stage "calamities for non-believers" during the Muslim holy month of Ramadan. William Brangham talks to Peter Neumann of the International Centre for the Study of Radicalisation and Political Violence about the outbreak of violent assaults and how they may be connected.