On 17th of August 1944 Sergeant Bengt Raoul Ringbom failed to return from training flight from an airfield near Ludwigslust around 3:30 am. Soon after his take off, several allied planes passed over the field (field is 100km east of Hamburg). Several hits were observed in the wreckage which were most likely caused by 20mm ammunition. Night fighters most likely surprised Ringbom considering that he wasn't aware of the allied planes being in the area.
No one saw the incident in German side but at that point of the war, I think it's most likely that it was a Mosquito.
That's the fellow, yes. Strangely, I can find a claim for the right day, right place, but in 1943.
I've downloaded the combat report, it clearly says 1943, and the Mossie pilot in question was making other claims around that time, but I can only find one claim for him in 1944, a V-1 in September. IIRC the website I got the info from put Ringborn's fate in the context of the wider war, as in the Finns went home soon after, so, I dunno, it's strange.
Thinking about it now, I have the relevant squadron ORB for August 1943, possibly also for 1944, will see if the incident is mentioned there as well. Will also check the relative times - combat report says 2:05 a.m., if that was one of the dates in which German time was one hour ahead (the Brits were often on double daylight savings time, therefore clocks in the U.K. matched those in Germany for much of the war) it could be an even deeper mystery...