Boston Marathon rocked by deadly explosions
Three people have been killed and more than 100 others injured as two powerful explosions detonated in quick succession near the Boston Marathon finish line.
The explosions occurred just before 3pm local time.
Television footage showed two blasts just metres from each other as competitors crossed the finish line.
Two other explosive devices were found nearby and detonated safely by authorities.
Police arrived with bomb-sniffing dogs and hotels were put in lockdown.
Many Australians were reported to be in the marathon field, including wheelchair athlete Kurt Fearnley and a team of indigenous runners led by Australian marathon legend Robert de Castella.
Officials say there are no suggestions of Australian casualties.
Of the 25,000 registered entrants for the Boston Marathon, 374 were British.
President Barack Obama has vowed that whoever planted the explosives would be found and brought to justice.
"We still do not know who did this or why. And people shouldn’t jump to conclusions before we have all the facts," the president told reporters at the White House.
The blast came on Patriots’ Day, Obama noted, which is a state holiday in Massachusetts that celebrates the beginning of the American Revolution.
Ian Jarrett
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