The bombing and sinking of RMS Lancastria popped up in the "on this day" Wikipedia feed.
In the article there is this paragraph:
When German aircraft began strafing survivors in the water, the fuel oil which had leaked into the sea ignited, and was quickly transformed into a flaming inferno. Many drowned; others were choked by the oil, or were shot by strafing German aircraft.
 sets off alarm bells. I couldn't find anything else on this topic. The Wikipedia Talk page makes no mention, nor do the references cited.
One of the sources mention that it was actually flares set off by survivors who ignited the oil, leading to the inferno.
My question: is there any confirmed information that the Luftwaffe went for targeted strafing of survivors?
Note: this excludes "general strafing" by German aircraft against beaches and vessels to hinder the evacuation of BEF and French forces.
Or is this just one of those Wikipedia things - made up out of whole cloth?