How to send equivalent of "Stop" command to a Google Home speaker?

If I send a media_player.play_media command to a Google Home speaker it will play the media file to the end, even if a media_player.media_stop is subsequently sent.
Is there a way to stop a media file from playing (i.e. the equivalent of saying “Hey Google: STOP”?

Have to tried media_player.turn.off

No, but I tried Pause and that seems to work (for now!)