Six Celtic fans have been arrested by Spanish police ahead of Celtic's Europa League clash against Valencia
According to reports, officers fired rubber bullets at visiting supporters and used their batons.
It is thought over 10,000 Celtic fans have travelled to Spain ahead of the Europa League match with Valencia.
A spokeswoman for the National Police said six Celtic fans were arrested on Wednesday night after allegedly throwing objects at police and damaging a police vehicle. One is accused of possessing drugs.
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A spokeswoman said: "We have six people under arrest, five of them for public disturbance."
The spokeswoman added: "One person has been arrested for drugs offences. He was coming by train from Castillon to Valencia with other supporters, who were causing trouble on the train.
"When officers arrived, they found this man with cocaine and crystal meth.
"I expect they will be going before a judge today. I don't know if they will be sent to prison."
Speaking to STV, Club security chief Ronnie Hawthorn said: "The message from the club is that only those with tickets should try to approach the stadium.
"If you have got a ticket, great. Enjoy what should be a fabulous experience. But if you don't have a ticket, watch it in a bar instead.
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"It is a common-sense approach, one that Valencia and the Foreign Office have issued as well."
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