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The streets around City Hall fell silent for 30 seconds before the crowd burst into a round of applause before the first of the participants were waved off at the start of the 26.2 mile route.
Three people were killed and more than 200 injured in last month's attack at the finishing line in Boston.
The men's race has been won by Joel Kipsang from Kenya in 2.19.27.
The women's race was won by Ukraine's Nataliya Lehonkova in a record time of 2.36.50.
Belfast Telegraph Digital