What was the first programming language with loop break?
I sent an email to Martin Richards to try and get some details/context about CPL and he gave me a reply. To partially quote:


  "CPL did have a break command to cause an exit from a repetitive command such as while or until. As far as I remember it did not have an equivalent of continue, but the equivalent loop command was added to BCPL early in 1967."


[...]


  "The introduction of break in CPL was almost certainly influenced by Dijkstra's paper..."


He also pointed me to the following document (see page 5):

http://www.cl.cam.ac.uk/~mr10/cpl2bcpl.pdf