SuperLeague players quizzed over brawl
The five were detained by police while their team-mates returned to France following Sunday's 28-20 defeat by Wakefield in their first game of the Engage Super League season.
A spokesperson for West Yorkshire police confirmed that nine men in all were in custody and that two men were taken to hospital for treatment to head injuries, which are not thought to be life-threatening.
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Hide AdThe incident was captured on CCTV at 2.15am yesterday in Boar Lane in Leeds.
In a statement, the Dragons said: "The club are co-operating fully with the police in their investigations. The club will make no further comment at this stage."
The incident comes less than three weeks after six Huddersfield players were arrested and bailed following rape allegations during that club's pre-season training camp in Newcastle.