- You mean the government knows what's causing it?
- Not definitely.

3 seconds sound clip from the Radar Men from the Moon - Moon Rocket (S1E1) movie soundboard.

You can hear this line at 00:02:59.183 in the Blu-ray version of the movie.

Quote context

[...]

- Our test with the model is satisfactory.

- If the government will let us make a few test flights with the rocket...

- It's out of the question.

- This whole project is strictly top-secret.

- Since you people developed the rocket ship for us and we'll be the ones operating it, it has been decided that you should know more of our plans.

- I've been authorized to tell you this much: its primary use will be to combat this wave of sabotage and destruction of our defense system.

- You mean the government knows what's causing it?

- Not definitely.

- But tests of the wreckage show that the explosions are of atomic origin.

- You mean someone's dropping atomic bombs on us?

- Not bombs. No planes have been observed, and the explosions aren't severe enough.

- No, from what I've learned of the nature of the blast, they see more like an atomic ray of some kind. Of course that's just a guess.

[...]