The NBA canceled Tuesday's game in Boston between the Boston Celtics and Indiana Pacers as a result of the explosions at the Boston Marathon that killed two people on Monday.
The Celtics-Pacers game will not be made up.
A spokesman for the NBA released a statement to ESPN that read: "First and most importantly, our thoughts and prayers are with all those affected by the devastating events in Boston. While we don't think it is appropriate to get into specifics, we regularly practice a wide range of state of the art security measures in all of our arenas.
"We will continue to work with our arena and team partners, along with local law enforcement to be proactive around the perimeter of our venues and maintain a high level of vigilance, as always."
Monday's NHL game in Boston between the Bruins and Ottawa Senators was also postponed, but that game will be rescheduled.