(Xinhua) -- Four bombs exploded in the northern Spanish province of Cantabria Sunday but cause no injuries, government officials and local media said. The blasts occurred in the coastal city of Laredo and the nearby beach resort town of Noja after a warning call, which said four explosive devices had been planted by the separatist group ETA. "We received a call at around 10:30 a.m. (0830 GMT) from someone who said they represented ETA and told us ETA had planted four bombs on beaches at Laredo, Noja and Noja golf course," said an emergency services official.
The caller also said the bombs would explode between 12:00 p.m.(1000 GMT) and 3:00 p.m. (1300 GMT), according to government officials. There were no casualties as the authorities evacuated the areas in response to the warning, they said.
Laredo and Noja are popular tourist destinations in summer, each with long, sandy beaches facing the Bay of Biscay. Authorities said the explosions marked the beginning of ETA's traditional summer bombing campaign, aimed at hurting Spain's key tourism industry by attacks on its holiday resorts.