This is definitely a class act move.  The New York Yankee's Baseball organization have put aside their rivalry between the Yankee's and the Red Sox to show their support for the city of Boston following the Boston Marathon bombings. 

They posted a sign on the outside of Yankee's stadium with both the Yankee's logo and the Red Sox logo that says "United We Stand".  The Yankee's also plan to honor Boston tonight with a moment of silence.