With high profile terrorist attacks in Paris, San Bernardino and elsewhere, 2015 was the year the world turned its attention more fully to the self-styled Islamic State. It was also the year that Americans confronted the possibility that terrorists could wreak even more havoc at home.
The Center for Public Integrity traced where the Islamic State's ammo comes from in 2014 and this year wrote about a grave setback in the U.S. military's effort to take on the group. Through a series of investigative and revelatory articles, it also brought new attention to the possibility that terrorists might get ahold of nuclear explosive materials, due to lax security controls in a handful of key nations.
From South Africa to Iraq and from Moldova to India, here are some of the most alarming stories we published about terrorism and nuclear-related risks in 2015.
South African facilities present a ripe target for nuclear terrorists