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Two were injured in a bomb blast in Ankara near the Hilton hotel, where the US president is due to stay at the weekend.

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A small Marxist group later said they carried out the attack, but the police would not comment on the claim.

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A second bomb went off on a bus travelling through a residential area of Istanbul.

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At least three people died in the blast, and some 15 more were injured.

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Police believe the bomb was not meant to explode on the bus.

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A third bomb was diffused in the north-western city of Yalova.

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Exceptional security measures have been taken ahead of a Nato summit due to begin on 28 June.

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Turkish people have been staging rallies against the gathering.

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But the White House has already announced the president's visit will go ahead as planned.