4/21/2014 - Boston, MA - Carole Robbins, cq, of Canton, ME, (center) watched the start line on the jumbo screen near the finish line on Boylston Street. Officials expected a million spectators to turn out for the 2014 Boston Marathon, on year after the Boston Marathon bombings that killed 3 and injured hundreds. Topic: 21marathonpix. Dina Rudick/Globe Staff.
Spectators watched the Boston Marathon from the crowded sidewalks on Boylston Street.
Dina Rudick/The Boston Globe

Boylston Street reached capacity just before 1 p.m. on Monday afternoon, according to a tweet from the Boston Police Department.

Spectators for the Boston Marathon crowded the sidewalks and forced authorities to redirect new arrivals to Kenmore Square.

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We will update this story as more information becomes available.