India's Federal Home Minister Sushilkumar Shinde said the bombs were attached to two bicycles about 150m (500 feet) apart, the Associated Press reports.
He said eight people died in one explosion and three in the other.
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The encounter in Havana airport is the first between the heads of the two branches of Christianity since a schism nearly a thousand years.
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Run by the NSPCC the helpline allows employees in any sector to raise concerns anonymously.