Nope. They're filled with bombs.
4 seconds sound clip from the V for Vendetta movie soundboard.
You can hear this line at 00:15:20 in the Blu-ray version of the movie.
Quote context
[...]
- I was on my way last night, but there were Fingermen and I got scared and went home.
- Sadly, after last night, I think our curfew will only get worse.
- Gotcha.
- Nope. They're filled with bombs.
- Well, wait till commercials to set them off, okay?
- I can't believe you watch that shit.
- What? Laser Lass is banging.
- Not sure. They just arrived. Marked for Stage 3.
[...]