Accord regulates international trade in conventional weapons, from small arms to battle tanks, combat aircraft and warships; critics say move will embolden terrorists

Anniversary of 1999 high school mass murder marked days after teenager, whose obsession with the shooting set off school closures and a manhunt, was found dead

Prosecutor rejects criminal complaints over firearms controls after shooting at Tree of Life, but says they could be considered later on 'if somebody is aggrieved by the law'

Unusual joint session of Pennsylvania lawmakers held a day after mayor signs new gun control measures; survivors of the deadly shooting also in attendance