At least five people were killed and two injured when a building collapsed early Monday in the capital of the Spanish holiday island of Majorca, police said.

Another four people may still be in the rubble of the building, which collapsed at around 12:30 am in the city of Palma, a police spokeswoman on the holiday island said.

The cause of the accident was not known, but witnesses told Spanish National Radio they heard an explosion moments before.

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Tags: building collapse, majorca, palma