Britian's trade union movement is in shock after the sudden death of firebrand rail union leader Bob Crow at the age of 52.
The general secretary of the Rail, Maritime and Transport union is believed to have suffered a heart attack at his home in east London.
The union announced the news "with the deepest regret" and said his death would leave a "massive gap".
Tributes poured in from unions, politicians and campaign groups, as well as business and industry leaders.
London Mayor Boris Johnson, who was embroiled in a bitter dispute with Crow over Tube ticket office closures last month, said Crow had fought "tirelessly" for his members.
Crow was one of the most high-profile, left-wing union leaders of his generation, sparking as much anger from passengers hit by rail and Tube strikes, as praise from his members for winning pay rises.
He was constantly involved in industrial disputes and campaigns and led a walkout by London Underground workers last month in a dispute over ticket office closures.
The straight-talking south Londoner was a passionate supporter of Millwall Football Club.
His death caused shockwaves in the trade union movement, and there is no obvious candidate to take over his job
