Workers on Sao Paulo's subway system have announced they will launch an open-ended strike, the latest to hit Brazil in the run-up to the World Cup, News agency AFP have reported.
The strike raises fears of transport chaos in the Brazilian economic capital, a sprawling city of 20 million people, one week before it hosts the opening match on 12th June.
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Penalties of £100 or a court fine of up to £1,000 can now be handed to anyone caught lighting up in a private vehicle with someone under 18.