Ten Britons and 11 Turks were wounded when their minibus blew up on one of the main streets of Marmaris, a busy tourist town on the Mediterranean coast. The British Foreign Office said three of the Britons were in intensive care.

There were no immediate claims of responsibility.

A Marmaris police official, who declined to be named, told Reuters 21 people were injured in Marmaris, including 16 people inside the minibus. Five others were hurt by two percussion bombs -- all three explosions happened within 15 minutes.

"There were three bombs ... Two of them were not important, they were percussion bombs," he said, adding the outlawed separatist Kurdistan Workers Party (PKK) was suspected of carrying out the attacks.

The bombs in Marmaris exploded between midnight and 0015 local time (2115 GMT) while the Istanbul blast, which injured six people, took place at 1830 local time.

Marmaris is a coastal resort popular with west European and Russian tourists as well as Turks -- for many the last weekend of their annual summer holiday.

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