Hundreds of Bolton Wanderers football fans have been detained at a Belgrade hotel ahead of the club's Uefa Cup tie.
Serbian police have held the supporters at the Hotel National amid security fears after trouble involving Red Star Belgrade supporters last weekend.
The club said the fans, on an official trip, are being held without reasonable explanation and it has expressed its "frustration and disappointment".
Bolton face Red Star in a Uefa Cup Group F match on Thursday evening.
A statement by Bolton said the club's feelings were shared by Uefa, the FA, the British Embassy, Red Star, and travelling British police.
The club said the supporters had been prevented from visiting Belgrade city centre before the match.
"Strong and intensive" representations had been made to the local police since the incident started, the club added.
The statement said: "However, all attempts to resolve this situation have been met with the response 'the matter is under consideration' from the Belgrade police.
"The actions of the Serbian police have been made entirely unilaterally and with no prior warning or agreement with Bolton Wanderers FC or other relevant parties.
"Bolton Wanderers FC are fully aware of a crowd order situation that arose last Saturday (when a Serbian police officer was attacked with flares), and we do understand that this may have increased security issues for the local police."
The club said it was seeking clarification of unconfirmed reports that the Serbian police had received specific intelligence that Bolton supporters were at risk of attack in the city centre.
Serbian police have held the supporters at the Hotel National amid security fears after trouble involving Red Star Belgrade supporters last weekend.
The club said the fans, on an official trip, are being held without reasonable explanation and it has expressed its "frustration and disappointment".
Bolton face Red Star in a Uefa Cup Group F match on Thursday evening.
A statement by Bolton said the club's feelings were shared by Uefa, the FA, the British Embassy, Red Star, and travelling British police.
The club said the supporters had been prevented from visiting Belgrade city centre before the match.
"Strong and intensive" representations had been made to the local police since the incident started, the club added.
The statement said: "However, all attempts to resolve this situation have been met with the response 'the matter is under consideration' from the Belgrade police.
"The actions of the Serbian police have been made entirely unilaterally and with no prior warning or agreement with Bolton Wanderers FC or other relevant parties.
"Bolton Wanderers FC are fully aware of a crowd order situation that arose last Saturday (when a Serbian police officer was attacked with flares), and we do understand that this may have increased security issues for the local police."
The club said it was seeking clarification of unconfirmed reports that the Serbian police had received specific intelligence that Bolton supporters were at risk of attack in the city centre.
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