German media - the weekly news magazine "Der Spiegel" and the public broadcasting corporation "WDR" - are reporting on data recorded by NATO AWACS operating in Polish and Romanian airspace.
Spiegel
WDR
Both reports are citing a statement by the German government in reply to a parliamentary inquiry by the German Left Party ("Die Linke"). Since they are only available in German here is a short synopsis:
NATO AWACS operating in Polish and Romanian airspace did detect radar-signals of an anti-aircraft-missile-system and another radar-signal, that could not be identified. The anti-aircraft-missile-system has automatically been classified as SA-3 "Surface to Air-Missile". The report said this would be a "signal recorded as as a matter of routine in the whole region."
The government statement to the parliamentary inquiry however does not say, whether MH17 was shot down by a SA3-system or a missile of another typ. Experts say, the signal could also belong to a BUK-missile, for example, if it has been fired without external radar guidance.
The statement concludes that concerning the use of anti-aircraft-missile-systems there was "no reliable evidence" from the Awacs.
The statement also says that the Awacs did not track MH17 during the decisive moments. The Awacs have recorded the Boeing 777 on their radar, however the tracking of MH17 stops at 14.52 CET, "as MH17 left the zone of reconnaissance of the Awacs-aircraft." MH17 was shot down some 30 Minutes later.
The statement also indicates, that the german government obtained information on recordings of the air-ground communication. However referring to the Chicago Convention, the German government does not want to publish any such information.