MADRID, May 14 (Reuters) - Spanish bank Santander said on Tuesday some data of its customers in Spain, Chile and Uruguay, as well that of its current and former employees had been the target of unauthorised access in a database hosted by a third-party provider.

"We immediately implemented measures to contain the incident, including blocking the compromised access to the database and establishing additional fraud prevention controls to protect affected customers," the lender, one of the euro zone's largest, said in a statement.

(Reporting by Inti Landauro and Jesus Aguado, edititng by Andrei Khalip)