Four bombs went off in northern Spain Sunday after a warning from a caller claiming to represent the Basque separatist group ETA, CNN`s partner station CNN Plus reported.

There were no immediate reports of any injuries.

After the warning call, the police cordoned off the targeted areas. The first explosion occurred near a beach in the town of Laredo. A short time later, a second bomb went off in nearby Noja, CNN Plus reported.

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The Associated Press reported that another bomb detonated earlier outside a bank in the northern town of Getxo, damaging a cash dispenser. An hour later, a fourth explosion occurred at a golf course close to Noja.

A caller claiming to represent ETA called authorities Sunday morning warning that four bombs were set to go off in and around Laredo, near the large northern city of Santander.

ETA has routinely targeted tourist destinations in northern Spain during summer months. The blasts have rarely caused injuries but have often resulted in disruptions.

ETA is blamed for more than 800 deaths and thousands of injuries during its violent campaign since 1968. The European Union and the United States list it as a terrorist group.