There are some information, that during military operation against revolutionary Hungary in X-XI 1956, there were an incident of shooting down 3 Mi-4s with Soviet comandos over Hungary airfiled.
This is strange info, does not look credible (?). Can someone confirme it?

2 -ed, were there any Soviet military air operations over Budapest? Shoould be some reccon mission combats rather not ?)
Where can I look at such information in Russia?

Hungary had got from SU tens of MiG-17 in VI 1956, these jets after revolution were taken back by the Soviet, is this true?