People react on Twitter to the Boston Marathon explosions
Two explosions were heard in Copley Square Monday afternoon around 2:45 p.m. at the Boston Marathon finish line on Boylston Street.
The area is on lockdown as runners and fans have left the area.
The hotel that serves as the headquarters for the Boston Marathon is also on lock down.
People took to twitter to react to the explosions.
Marathon Monday is a joyous occasion in the city of Boston as many people do not work and head toward Boylston Street to watch the runners cross the finish line.
Read reaction below.