It's beer o'clock at Tesco

It was an offer to good to miss - and that's why police were called to restore order outside a supermarket in Scotland when a pricing error slashed the price of cartons of beer.

The drama unfolded at a Tesco supermarket.

The deal should have sold three cartons of alcoholic drinks for £20 but when shoppers go to the till, the offer got even better. The price registered was just £11.

Police were called after heavy congestion was reported in the car park as customers rushed to get the deal, the BBC reported.

A spokesman said staff spotted the problem and prices were changed manually until it was fixed.

There were also problems at two other stores.

One customer told the BBC there was "bedlam" as people phoned friends, used social networking sites to spread the word and went back several times to get more beer.

Graham McKenzie tweeted: "Price glitch for beer has literally caused a stampede at the local Tesco. Tempers are flying in car park."

Rebecca Macdougall tweeted: "Was casually chatting to my dad about the beer situation at Tesco mention 3 crates for 11 quid and he sprints to the car."