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Tempers flared in Portugal on Monday as traditional taxi drivers protested against government moves to regulate ride-hailing apps like Uber, accusing them of unfair competition.
Scuffles were reported in Lisbon and a handful of people detained.
A cortege of cabs staged a go-slow in the capital, causing rush-hour chaos and temporarily blocking access to the airport.
"This can't go on," said Florencio Almeida, leader of the ANTRAL taxi drivers' association.