When news spread of the explosions at Monday’s Boston Marathon, numerous athletes took to Twitter to share their concern about the bombings.

New York Jets quarterback Tim Tebow was almost at a loss for words when he heard what happened.

“Wow... Praying for everyone effected by the explosions in Boston today,” tweeted Tebow.

Even athletes who don’t play in the United States sent their support to those in Boston. There was a moment of silence before Arsenal played Everton at the Emirates Stadium in London.

“Thoughts with everyone affected by the explosions at the #bostonmarathon horrible scenes,” tweeted Arsenal midfielder Jack Wilshere.

The Boston Celtics had their regular season schedule changed because of the explosions. The team was supposed to host the Indiana Pacers on Tuesday in their final home game. However, the game was cancelled and will not be rescheduled.

NBA player LeBron James also took to Twitter to express his horror at the explosions.

“Prayers goes out to those involved/hurt in #BostonMarathon. WTF is wrong with people man. Just sad.”

Shortly before the explosions, the Boston Red Sox had their most exciting win of the 2013 MLB season at Fenway Park. A Mike Napoli RBI double gave the Red Sox a walk-off win against the Tampa Bay Rays.

Red Sox third baseman Will Middlebrooks sent out several tweets after the shocking events of Monday.

“Wow. What is wrong with people. #prayers #bostonmarathon,” said Middlebrooks. “Wrong city to mess with…#Boston.”

The Boston Bruins were supposed to host the Ottawa Senators on Monday night. The contest was postponed until Tuesday.