MEXICO CITY (AP) — Fifteen people died and 47 are being treated for their injuries after a bus carrying holiday tourists overturned on a highway in the Pacific state of Nayarit, authorities said. Saturday.

Authorities from the nearby state of Guanajuato said all the passengers were from the same city, León, in that state. It is not unusual for friends, relatives or neighbors in Mexico to pool their money to rent a bus for a beach vacation.

Nayarit prosecutors said the accident occurred on Friday, on a rural stretch of highway. They said the dead included at least four children.

Local media said the travelers were returning from Guayabitos, a coastal town north of Puerto Vallarta.

The causes of the accident were under investigation. Forty-five of the injured were being treated at local hospitals and there was no immediate information on the condition of the injured.

In the past, such crashes have often been caused by poorly maintained rental buses, bad weather or road conditions, or speeding.