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Two members of the youth organisation Arran stormed the coach this morning when it stopped outside the Olympic village and hung a huge sign saying "Stop mass tourism in the Catalan countries".

The campaign group posted a picture of the demonstration on its Facebook page where it had earlier warned of new protests in various parts of Spain to show their disgust at overcrowding in holiday hotspots.

The activists insist they are NOT against tourism but "massification" which, they say, is ruining local people's lives, harming the landscape, damaging beaches, pricing residents out of the property market and "eating up the coastline".

Just two weeks ago, protestors wearing masks from the same group had to be cut free after chaining themselves to a famous Gaudi sculpture in Barcelona.

The new attack happened just before 10am this morning, with Arran saying tourist buses are "a symbol" of what they are fighting against.

The protestors climbed to the top level of the open-air bus, hung their poster and let off two smoke flares. There were holidaymakers on the coach but it is understood no damage was caused to the vehicle and no-one was hurt.