The band , aged 21 and 25 , broke away from their tour schedule on Saturday . Tourists used a coin to carve 12 - inch high bronze J and N into the wall . Both charged with ' damage on a building of historical and artistic interest ' They have reportedly apologised saying that they ' regret ' their actions . built in first millennium CE , the Colosseum is a UNESCO World Heritage Site .
The women , aged 21 and 25 , broke away from their tour group on Saturday . Tourists used a coin to carve eight-inch high letters J and N into the wall . Both charged with 'damage on a building of historical and artistic interest ' They have reportedly apologised saying that they 'regret ' their actions . Built in first century CE , the Colosseum is a UNESCO World Heritage Site .