Soccer yobs went on the rampage smashing bus windows as trouble erupted prior to Saturday's Preston and Blackpool derby.
Several windows on one of three buses ferrying Blackpool supporters to Preston North End's Deepdale ground from Preston Railway station had been kicked in by hooligans.
A seat was also ripped out and thrown through an empty window.
Nine Blackpool fans were arrested and will be questioned today.
Angry Preston Bus chiefs instantly said the damage would run into thousands of pounds.
The derby game - the first between the two sides in seven years - sparked a huge police operation.
Around 300 police officers are on duty outside the ground and in the city centre.
Blackpool fans arriving at the railway station were shepherded on to the buses after going through airport-style security scanners to check for potential weapons.
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Police and stewards also frisked both sets of supporters as they entered the ground.
Peter Bell, managing director of Preston Bus, said: "It is pretty disappointing, we put these buses on to help out the police.
"We don't do it for business reasons we do it so people won't be wandering round the city centre and to try and avoid trouble.
"We will have to carry 600 passengers to pay for the damage that has been done."
A police spokeswoman said: "The bus was being escorted to the ground and it appears windows were kicked in and a seat thrown off the top deck.
"Nine people have been arrested. We are investigating."