President Obama yesterday,

Obama said no group had succeeded in obtaining (nuke) bomb materials but that al Qaeda had long sought them, and he cited actions by Islamic State militants behind recent attacks in Paris and Brussels that raised similar concerns.

"There is no doubt that if these madmen ever got their hands on a nuclear bomb or nuclear material, they would certainly use it to kill as many innocent people as possible," he said. "It would change our world."

Obama hosted more than 50 world leaders for his fourth and final summit focused on efforts to lock down atomic materials to guard against nuclear terrorism, which he called "one of the greatest threats to global security" in the 21st century.
(Reuters)