An Army captain sued President Barack Obama on Wednesday, alleging that he doesn't have the proper congressional authority to wage war against Islamic State militants in Iraq and Syria.

Fierce fighting and airstrikes by a Saudi-led coalition pounded northern Yemen, as the two main parties in the country's conflict continued to violate a ceasefire agreement and undermine already tenuous peace talks in Switzerland.

One AP investigation uncovered an attempt to sell bomb-grade uranium to a real buyer from the Middle East, the first known case of its kind.