Lined up in front of their dugouts, all wearing No. 42 on Jackie Robinson Day, the Washington Nationals and Miami Marlins stood for a moment of silence to honor bombing victims at the Boston Marathon. What began as an annual celebration to salute the man who broke baseball's color barrier 66 years ago turned somber after a pair of explosions near the finish line in Boston -- about a mile from Fenway Park -- killed three people and injured more than 130 on Monday. Hours later, Major League Baseball went on with ceremonies for the fifth Jackie Robinson Day at stadiums all over the country and north of the border in Toronto. "Our thoughts and prayers are with everyone affected by this horrible occurrence and we are monitoring the situation," MLB spokesman Pat Courtney said in a statement. "The safety of everyone that comes to our ballparks is always our top priority and we will continue to do everything to ensure a safe environment for our fans." Source: ESPN