Europa League favourites Manchester United have work to do after they were held to a 1-1 draw by Anderlecht in the first leg of their quarter-final tie.
The start of the high-risk encounter in France had to be delayed 45 minutes as officials attempted to clear the pitch of scores of Lyon fans.
There was trouble outside the ground ahead of the match between French side Lyon and Turkish champions Besiktas.
Lyon coach Bruno Genesio was saddened and disappointed by clashes between his club's fans and Besiktas supporters before their Europa League clash.
Crowd disorder delayed the start of Lyon's match against Besiktas in the Europa League quarterfinals, as fans spilled out onto the pitch in the fracas.
Lyon's director of security, Annie Saladin, said about 50 Turkish fans forced their way inside the stadium and were responsible for the trouble.
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Monday after she had gone to a second home in Harlem, and also spoke with her assistant on Tuesday, he said. Find us on Facebook too! Former chief judge Jonathan Lippman said he knew Abdus-Salaam for many years.
Turkish club Besiktas are in France for the last eight first-leg clash at the Parc Olympique Lyonnais tonight - but created a ruckus outside the stadium.
When the match finally got underway, goals from Corentin Tolisso and Jeremy Morel in the 83rd and 85th minutes earned Lyon a 2-1 win.
The incidents were the latest in a tense week for European football after the Borussia Dortmund team bus was attacked with explosives on Tuesday just before their Champions League game at home to Monaco.
"If I were one of my defenders, I would be very disappointed because they had serious work and the people who had to kill the game didn't", Mourinho said.
In April 2000, two English fans from Leeds were stabbed to death during clashes prior to a UEFA Cup semifinal against Galatasaray in Istanbul.
Fights also broke out between rival fans in the stands before the match.
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