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19 April 2013, 05:00
Runners from Norfolk and Suffolk have told Heart events in Boston won't put them off running in this weekend's London marathon.
It's after two bombs went off during the Boston Marathon on Monday, killing three people.
It sparked an urgent review of security at the event in London on Sunday.
20-year-old Kassandra Bailey from Norwich, who is running for eating disorders charity Beat, says she is determined to carry on as normal.
Sarah Farley is one of six people from Greene King brewery in Bury St Edmunds running the marathon. They are running for the charity that the brewery is supporting this year, Macmillian Cancer Support. They are hoping to raise £12,000.
Sarah told Heart she'll can't let the charity down.