Credit: @Yankees/Twitter

New York Yankees and Boston Red Sox: It's a fierce and storied baseball rivalry that goes back decades and is arguably the biggest in American sports.

But in the wake of the Boston marathon bombing Monday that left three people dead and at least 170 people injured, the Yankees are putting differences aside at tonight's game to pay tribute to their baseball brethren in Boston.

The Yankees tweeted today that the team will hold a special moment of silence tonight at their home game against the Arizona Diamondbacks, and will also lead the crowd in a rendition of Neil Diamond's "Sweet Caroline" at the end of the third inning, an honored tradition at Fenway Park.

Our thoughts are with the Boston community. Tonight there will be a special moment of silence & Fenway favorite Sweet Caroline @ end of 3rd.

- New York Yankees (@Yankees) April 16, 2013

The tweet has been retweeted more than 8,000 times.

The Yankees followed it up with a second tweet showing a photo of the signs at Yankee Stadium decorated with love for Boston. The photo has been retweeted more than 9,000 times.

We stand united with the @ redsox: twitter.com/Yankees/status…

- New York Yankees (@Yankees) April 16, 2013

The Red Sox responded in kind, thanking the Yankees for being "bigger than the game."

Bigger than the game. Thank you! RT @ yankees We stand united with the @ redsox: twitter.com/Yankees/status…

- Boston Red Sox (@RedSox) April 16, 2013

Diamond's 1969 hit song "Sweet Caroline" has been a fixture at Red Sox home games for at least 15 years. It is usually played during the bottom of the eighth inning, and fans will belt out the "Bah-bah-bah" and "So Good, So Good, So Good" rather raucously.

Tonight, the Bronx will sing.

ABCNews.com contacted representatives of both the Red Sox and the Yankees, but they did not immediately comment.

In the wake of Monday's tragedy, other baseball franchises have joined the Yankees in showing their support for the Red Sox.

The Baltimore Orioles and the Tampa Bay Rays, fellow American League East teams that will face off tonight in Baltimore, tweeted they will also hold a moment of silence.

The Rays and Orioles will observe a moment of silence before tonight's game at Camden Yards. Our thoughts & prayers are w/ those in Boston.

- Tampa Bay Rays (@RaysBaseball) April 16, 2013

The Orioles extend our heartfelt condolences to those impacted by yesterday's tragedy in Boston.

- Baltimore Orioles (@Orioles) April 16, 2013

Two other baseball teams close by, the New York Mets and the Philadelphia Phillies, also tweeted their condolences:

Our thoughts and prayers go out to Boston and everyone affected by this tragedy. #PrayForBoston

- New York Mets (@Mets) April 15, 2013

Our heartfelt thoughts and prayers to everyone affected by the events in Boston today.

- Phillies (@Phillies) April 15, 2013

The Chicago White Sox and the Cleveland Indians, both in the same league as the Red Sox, tweeted that flags will be flown at half-staff at their respective stadiums for tonight's games.