The CRTC said in a Friday release it is making participation in a national emergency-warning system mandatory for broadcasters. Cable and satellite providers, radio stations, over-the-air television broadcasters and video-on-demand services must all begin to issue public alerts such as warnings about tornadoes, floods and industrial disasters, as well as Amber Alerts, by March 31, 2015. Campus, Native and community-based broadcasters will have another year to comply, and must broadcast the warnings by March 31, 2016. Participation in the National Public Alerting System was previously voluntary for broadcasters. When the CRTC announced a consultation on the issue this February, it noted responses to letters it sent to broadcasters and service providers in 2013 indicated that some were distributing emergency alert messages while others were not.