However, he protest was seemingly unrelated to the tourist attraction. One group was protesting the announcement that plans for an additional airport had been scrapped by the government, while some 20,000 teachers were on strike demanding pay raises, the Associated Press reported.
The government dispatched some 1,000 riot police, state news agency Andina reported.
PeruRail subsequently suspended rail service Wednesday and Thursday, promising to refund or reschedule the money for tickets already purchased, according to Reuters. The railway was forced to suspend service for several days last year because of protests.
Machu Picchu is a sprawling Inca city that dates from the 15th century, and it is one of the best-loved archeological sites in the world, attracting some 1 million visitors annually. Summer (winter in Peru) is traditionally the high season for tourism, as the weather tends to remain drier.