There was a very high degree of radiation.
4 seconds sound clip from the Night of the Living Dead (1968) movie soundboard.
You can hear this line at 00:58:51 in the Blu-ray version of the movie.
Quote context
[...]
- You're coming from a meeting regarding the explosion of the Venus probe. Is that right?
- Yes, yes, that was the subject of the meeting.
- Do you feel there is a connection between this and the phenomenon...
- There's a definite connection. A definite connection.
- In other words, you feel that the radiation on the Venus probe is enough to cause these mutations?
- There was a very high degree of radiation.
- Well, just a minute. I'm not sure that that's certain at all. I don't think that has been...
- It's the only logical explanation that we have at this time.
- I can't speak for the entire military at this time, gentlemen.
[...]