Twenty-one-gun salute ring out and formation jets trail Brazil's national colours as UAE President Sheikh Mohamed greets Lula da Silva at presidential palace in Abu Dhabi.
Comments by Mexico's president follow a report citing a leaked US classified document that noted the potential for worsening tensions between branches of Mexico's armed forces.
White House Republican hopefuls including Donald Trump descend on Indianapolis for annual NRA convention, highlighting American gun lobby's continued political potency even as US reels from latest spate of mass shootings.
