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Map of Boston Marathon explosion

Source: NBC News, Boston Globe, Boston Athletic Association

With thousands of runners still on the course, two bombs exploded near the finish line of the Boston Marathon on Monday, killing two people, injuring at least 100 and turning the city’s most celebrated event into a grisly spectacle of shattered glass, blood and screams.

The two explosions happened about 50-100 yards apart on Boylston Street in Boston’s Back Bay neighborhood.

The first explosion occurred at about 2:50pm ET at 671 Boylston Street, according to the Boston Globe, where bleachers and a grandstand were set up just yards away from the marathon’s official finish line. The location is about a block from Copley Square and across the street from Boston Public Library.

The second explosion happened 5-10 seconds later further west on Boylston Street, closer to Fairfield Street.

Related links:

Explosions rock finish of Boston Maraton; 2 killed and scores injured

'Pandemonium': Witness accounts of the Boston Marathon bombing

NYC, DC increase security in wake of Boston explosions