Sabotage in Norway on 14 August 1944

[Laurent Rizzotti]

I found this today (while searching something else, as usual):
"On 14 August 1944, Nielsen initiated the sabotage against the Luftwaffe's depot at Bjølsen, where the Luftwaffe had confiscated part of a bus garage belonging to Oslo Sporveier. The depot had been moved there from Kjeller in fear of air strikes. Nielsen extracted information about the location from a contact in Oslo Sporveier, and also came along due to Gregers Gram's stay in Sweden at the time. The saboteurs sneaked into Oslo Sporveier's part of the garage, and stole keys from a night watch without drama. Nielsen kept guard in the night watch office; the other participants were Max Manus, Gunnar Sønsteby, Andreas Aubert, Henrik Hop, William Houlder and Erik Hansen Bakke. 120 kilograms (260 lb) of plastic explosives, carried to the garage in four suitcases, and a sack with 30 kilograms (66 lb) of dynamite were detonated. There was a fire lasting three days in which the Luftwaffe lost 25 Messerschmitt Bf 109's, 150 aircraft engines and their largest store of spare parts for fighters in Norway."

Source: https://en.wikipedia.org/wiki/Roy_Nielsen (yes, Wikipedia...)

I know that in 1944, the Luftwaffe was lacking men more than aircraft, but still 25 Bf 109s lost in one explosion will he a hard blow to a force of the size of the Luftwaffe in Norway in 1944. And my experience with French resistance claims is that such claims could be highly overrated.

So my question is: has someone a trace of this sabotage in a German document or an ULTRA intercept ?

Thanks in advance