Palma de Majorca (Spain), Aug 9 (DPA) Three bombs exploded on the Spanish holiday island of Majorca Sunday as the militant Basque separatist group ETA seemed to be stepping up its renewed bombing campaign.

The attacks seemed designed to draw attention more than to harm people. All contained low levels of explosives and were only detonated after warnings had been given allowing ample time to clear people from the blast sites. No injuries were reported.

But they came on the same day that ETA claimed responsibility for several recent bombings in Spain.

The first of Sunday's bombings occurred at a restaurant on the outskirts of Palma de Majorca, along the road leading from the city centre to the island's airport and near a recreational harbour.

The explosive was hidden in a backpack in one of the restaurant's bathrooms.

The second explosion came about two hours later, in another restaurant only about 500 metres from the first. The third came in a nearby underground supermarket shortly afterwards. The shopping complex had already been sealed off by police.

The attacks are another blow to the island's tourism industry and came the same day ETA released a statement to the Basque daily Gara claiming responsibility for several recent bombings, including an attack on Majorca in which two police officers were killed.

In its statement, the group said it had carried out the car bomb attack July 30 in the resort town of Palmanova in Majorca.