Foreign Secretary Philip Hammond said he was "shocked by the attack in Istanbul".
He added: "Thoughts are with those affected. We stand ready to help."
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Foreign Secretary Philip Hammond has condemned the bomb attack in Istanbul which killed 11 people and injured a further 36.
Mr Hammond said on Twitter that his thoughts are with the victims of the "senseless and appalling act of violence".
Thoughts with the victims of today's #Istanbul bomb attack. The UK utterly condemns this senseless & appalling act of violence.
US ambassador to Turkey John Bass also condemned the "barbarous terror attack", and extended condolences to victims and their families.
Turkey's President Recep Tayyip Erdogan visited victims being treated in hospital today, and said the country would fight terrorists "to the end".
No-one has yet claimed responsibility for the attack, which occurred during rush hour in the central Istanbul district of Vezneciler.
It is the fourth major bombing in Turkey's biggest city this year.
Philip Hammond has become the first British foreign secretary to visit Cuba since before the communist revolution of 1959.
Arriving in the capital Havana, Hammond said Britain was keen to forge "new links" with Cuba, and the two countries are "set to reach new cooperation agreements on energy, financial services, education and culture, to the benefit of both our nations".
His visit follows US President Barack Obama's historic visit last month intended to normalise relations between the two countries after decades of hostility.
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Foreign Secretary Philip Hammond has said Russia should be judged on actions not words as he awaited confirmation of its partial withdrawal of forces from Syria.
Mr Hammond told the Commons the international community had not received "independent evidence" of the downscaling of Russian forces
He said he would be "delighted" if the reports were verified but said no members of the International Syria Support Group were given advance notice of Mr Putin's surprise announcement and urged caution.
No one would be more delighted than me if, after five months of relentless bombing, Russia is genuinely winding down its military support to the brutal Assad regime.
But, as in all matters related to Russia, it is the actions rather than the words that count. We shall be watching carefully over the coming days to see if the potential promise of this announcement turns into reality.
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There is a "legal basis" for Britain taking military action against so-called Islamic State in Syria, Foreign Secretary Philip Hammond said.