DE
Yes, that's an overnight. In the early days of News 24, there were separate overnight bulletins, World even produced one of their bulletins for transmission on News 24 during a back half-hour ISTR (rather like the 0930 BBC World bulletin that News 24 carried for a long time). Joint bulletins from 0100 until 0500 became the norm in around 1998. It took quite a while to persuade the News Channel to leave a second of silence at the top of the hour for World to get in cleanly (as demonstrated by that clip). There was an awkward time when BBC World retained the flags but News 24 had gone Lambie-Narin: so overnight BBC World had a very different look to the rest of the day.
Two minutes regions...