The probe was launched after an Italian guide filmed the 17-year-old woman using her smartphone to engrave the letter “N” on a wall of the historic monument on Friday, Italian news agency ADN Kronos reported.
The Swiss tourist could face a fine of up to 15,000 euros (CHF14,550) for damaging cultural property.
This is not the first such incident. On Sunday, the Italian agency also reported that a 17-year-old German on a school excursion had been fined for damage. He was caught carving on a wall of the Colosseum on Saturday, causing a fragment of brick to come loose.
Just a few weeks ago, a young tourist of Bulgarian origin living in England carved his name and that of his girlfriend on a wall of the Colosseum, sparking indignation from the Italian culture minister. A video posted on the internet caused a furore. The Bulgarian has apologised, but nevertheless had to pay a substantial fine.
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