GENEVA/PARIS, Sept 22 (Reuters) - The World Trade Organization said on Thursday the European Union had failed to rein in billions of dollars in subsidies to planemaker Airbus , ratcheting up tensions in the battle for airliner orders worth trillions of dollars a decade.

MONTREAL, Sept 22 (Reuters) - Canada's main autoworkers union, Unifor, said on Thursday that Fiat Chrysler Automobiles was its next target in negotiations, after securing a tentative deal with General Motors Co this week.

LIBREVILLE (Reuters) - Gabon's Constitutional Court began hearing arguments on Thursday in advance of its ruling on an election that opposition leader Jean Ping said was rigged to give President Ali Bongo victory.

WASHINGTON, Sept 22 (Reuters) - President Barack Obama awarded 24 American giants of the arts and humanities with medals on Thursday, lauding their accomplishments - and sharing some laughs.

NEW YORK (Reuters) - Iran's President Hassan Rouhani said on Thursday that American companies were welcome to invest in Iran.

MEXICO CITY (Reuters) - Mexican President Enrique Pena Nieto said the resignation of his finance minister and trusted aide Luis Videgaray was prompted by Donald Trump's visit to Mexico last month, which led to widespread condemnation of the government.

TORONTO (Reuters) - Canada's practice of putting children in immigration detention centers or separating them from detained parents is causing them psychological harm and violates international law, a rights group said on Thursday.

(Reuters) - Danish drugmaker H Lundbeck A/S's highly anticipated experimental Alzheimer's drug failed in a late-stage study, underscoring the challenges faced by drugmakers to tackle the debilitating memory-robbing disease.

TORONTO (Reuters) - Ralph Krueger stood at the podium talking hockey but thinking soccer.