The union representing immigration staff at British airports says its members have voted to go on strike in a dispute over pay and job losses.
The vote by the Public and Commercial Services Union raises the prospect of a possible walkout during the Olympics, although no strike date has been set.
Union leaders meet Thursday to decide their next move, which could include a walkout at border control posts at ports and airports, or a ban on overtime. The union is fighting government plans for budget cuts and pay freezes.
The British government is keen to avoid any disruption as visitors descend for the July 27-Aug. 12 games.
Heathrow Airport has been beset for months by long lines at passport control that the union blames on government spending cuts.
