In the decades before 24-hour news networks such as CNN began to exist, programming interruptions were restricted to extremely urgent news, such as the death of an important political figure. For example, one of the earliest such interruptions that modern viewers would recognize as "breaking news" coverage was for the assassination of U.S. President John F. Kennedy in 1963, (with CBS News anchorman Walter Cronkite's coverage being especially noted), and as such reflected the relatively crude technology and procedures of that era. Such breaks are now common at 24-hour news channels, which may have an anchor available for live interruption at any time. Some networks, such as Sky News, largely emphasize this, even advertising the station/network as being " first for breaking news".