For much of the 20th century Northern Ireland was marred by violence, as Irish republicans and forces aligned to the United Kingdom fought over the future of the region.

That conflict, known as the Troubles, officially came to an end with a peace agreement in 1998.

But now the violence is flaring up again, and there are concerns the fragile peace deal is on the verge of being shattered.

Today, world editor for The Saturday Paper Jonathan Pearlman on what's behind the new wave of violence across Northern Ireland and what might happen next.