Dozens of shopping trolleys were abandoned outside a tower block after two social media superstars visited a nearby supermarket.

Police were forced to stop traffic after crowds of excited teenagers descended on Asda in St Albans Road on Friday when Watford-born YouTuber and musician KSI and his business partner Logan Paul launched their sports drink Prime.

The 37 trolleys were found left on the grass outside Abbey & Munden View, Meriden on Saturday, the day after the internet celebrities’ bus visited the supermarket.

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Around 20 police officers and ten police cars were called to the area as hundreds of teenagers blocked traffic in the car park and nearby St Albans Road and the A41.

Watford Observer: The trolleysThe trolleys

Some shoppers reported being kept inside the supermarket by staff until things had calmed down.

The person who found the carts said they were presumably taken from the store during the chaos of the event.