So my Hunter players (the old HtR) have just conducted a high profile terrorist attack with multiple civilian casualities last session. Believe me or not, somehow this was actually a fairly sensible, even if extreme plan on their behalf.

Anyway, they got away from the scene of crime relatively easily, but obviously the authorities are going to get their asses soon, especially since they're not skipping town. I'm wondering in what way to determine how soon though.
My current idea is to allow the players to make a couple of tests representing the various ways in which they are trying to hide and cover their tracks (probably skills like stealth, streetwise, subterfuge etc. depending on their specific plan), count the successes they scored and then make the authorities make an extended investigation test with that many successes as their goal and each attempt representing, say, 12 hours of investigation
Does that sound sensible?