Italian police are investigating a young Swiss woman on suspicion that she carved her initials on the wall of the Colosseum in Rome.

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 for damaging cultural property.