A subway train derailed Monday in the eastern Spanish city of Valencia, killing at least 41 people and injuring 47 others.
Authorities are ruling out terrorism, calling the disaster an accident. They say the train was speeding and one of the wheels broke into pieces.
Officials say two cars ran off the tracks, overturned, and crashed into a wall as the train was approaching a station.
Spanish Prime Minister Jose Luis Rodriguez Zapatero canceled the rest of a visit to India because of the accident and headed back to Spain.
Thousands of people are in Valencia for the Roman Catholic Church's World Meeting of Families later this week.
The Vatican says Pope Benedict XVI is praying for the crash victims.