Boston marks the fourth anniversary of the 2013 Boston Marathon bombings Saturday. The annual remembrance is now known as One Boston Day, a day of public service, ceremonies and events throughout the city.

Saturday morning, Massachusetts Gov. Charlie Baker and Boston Mayor Marty Walsh helped place wreaths at the sites of the two explosions on Boylston Street.

WBUR's Alex Ashlock was on Boylston and joined Weekend Edition Saturday to discuss the days events.