CCTV footage appears to show the bizarre moment a man used thick superglue to stop shutters at an amateur football club from opening.
During the short clip, a man can be seen walking up to AEK-BOCO FC's building with his dog and apparently applying the substance.
Vice-chairman Donald Russell, who volunteers at the Hanham club which supports 500 children, said he spent hours removing the glue.
The incident happened on April 21, at around 9:10pm.
Police are now reviewing the footage and are appealing for witnesses.
"It's madness," said Mr Russell. "I couldn't believe it was a middle-aged man.
"He looks like he could be wearing his slippers so it's likely he's local.
"We don't have much money as a club so we couldn't pay for anyone to come out. I had to do it myself.
"When I told the committee what happened they all thought it was going to be kids."
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A spokesperson for Avon and Somerset Police confirmed officers were now reviewing the CCTV.
Anyone with information should call 101 or click here, using crime reference number 5220091593.
