Reeling in Syria, Iraq, Islamic State Tries to Surge Online

While Islamic State fighters in Syria and Iraq have largely been forced underground, the terror group's other fighters along with its media operatives appear intent on surging, combining an increase in attacks with ramped-up output on social media.

The strategy comes as little surprise to U.S. officials who have long warned the fight against IS would not end with the collapse of its self-declared caliphate in March.

But the wave of propaganda, following the deadly Easter Sunday...