Police in Portugal detained an English fan for questioning in Lisbon in the early hours of this morning after tear gas was thrown into a bus carrying members of a marching band.
Witnesses said a group of English fans threw a gas canister inside the bus which was taking home teenagers who had taken part in a parade on Saturday night in honour of the city's patron saint.
Riot police moved in to Lisbon's main square after members of the band got off the bus and scuffled with a small group of English fans, a Portuguese radio station reported.
Earlier in the day in the same square police had to intervene after a group of English fans attempted to block traffic, the station claimed.
Around 50,000 English fans are expected in Lisbon today for England's Euro 2004 Group B clash against France.
UEFA had warned that England will be kicked out of their tournament if any of their fans are involved in serious trouble.
However, UEFA president Lennart Johannson today told the BBC that he was happy with the preventative measures that British authorities have taken to avoid violence, including issuing more than 2,500 banning orders preventing known or suspected hooligans from travelling to Portugal.
Johannson said:"We shouldn't blame the FA or the team for the hooligans. We are happy with the preventative steps the FA has taken - to me they seem to have things under control." He added: "I hope that people accept that I'm the spokesman of UEFA. I think other people got it wrong."
Filed by James Boylan