Two men stole a cash bag from a bus driver on Brighton's Whitehawk estate.
He was remonstrating with one of the men who had urinated on the top deck of the number 1 service last night.
Meanwhile the man's accomplice went downstairs and grabbed the bag, containing a small amount of cash.
The driver noticed the theft minutes later when the two men had left.
Roger French, managing director of Brighton and Hove Bus and Coach Company, said: "Luckily we caught the incident on CCTV and the film has been passed to police.
"We anticipate a quick arrest and hope the courts will deal with this as a very serious matter.
"Thankfully there was no violence used."
Police said both offenders had been.
The theft took place shortly before 9pm in Swanborough Drive.
Anyone with information should call Inspector Julie Wakeford on 0845 6070999.
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