Hello Peter,
perhaps the Allied fighters you were asking about were the P-51s of 4th and 352nd Fighter Groups USAAF that were escorting bombers during the FRANTIC operation to Russia on 21. 6. 1944. There were some encounters with Luftwaffe over Poland and some German aircraft were claimed shot down by the Mustang pilots, among others over Kobryn and Brest-Litevsk (sorry, I do not have the complete list of USAAF claims, perhaps Frank Olynyk could help...).
The RAF fighters seem to be ruled out, because the area mentioned by you is out of their range.
Hope this helps a little,
Ota
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