Emergency services report that a two-story building in Majorca collapsed, leaving four persons dead and twenty-one injured.
At the location of the Medusa Beach Club, a restaurant by the sea on Cartago Street in Palma de Majorca, it is thought that multiple people are imprisoned.
The incident reportedly happened at about 20:30 local time (19:30 BST).
Psychologists have also been sent to the scene, according to the local emergency services.
Numerous people inside the structure at the time of the collapse were tourists, eyewitnesses informed local media. The region's booming tourist season officially begins in May.
The mayor of Palma, Jaime Martínez, is said to have travelled to the scene with the Deputy Mayor of Tourism.
The president of the Balearic Islands, Marga Prohens, said she was shocked by the incident and sent her condolences to the victims’ families.
Ms Prohens also thanked the emergency services and Pedro Sánchez, Spain’s Prime Minister, for his support.
The prime minister said he is closely following the incident and said his government is willing to collaborate with “all the means and personnel” needed, in a statement on X.
Majorca is one of Spain’s Balearic Islands, which more than 14 million tourists visited last year according to official figures.