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(NEWSER) – Runners preparing for today's 118th Boston Marathon will see some notable differences a year after the bombing—starting with the number of people running. This year, some 36,000 will take part, or 9,000 more than usual, NBC News reports. That's the second-biggest field the marathon has ever seen, Reuters notes. About 5,000 of this year's participants were running last year during the explosions; groups are taking part in honor of those who were killed or injured last year, the Wall Street Journal reports. They'll all see stepped-up security, with twice last year's number of cops patrolling the course, totaling about 3,500.

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