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From the first episode of Death Note, a TV news reporter says
犯人は保育園内で死亡！
I can see that する is being omitted from this sentence. But I'm curious/confused if other words or particles are also being omitted? In particular,
保育園内で
is a bit confusing. Here 内 appears to be modifying 保育園 as if it were a particle?
内 works as a suffix or as a standalone noun, similar to the English inside (e.g., inside a car/the inside of a car).
When used as a suffix, 内 is read ない (always, I think). As hiroki's answer suggests, it connotates the 'building'-ness of the preceding noun.
That is, 保育園[内]{ない}で sounds in the building of the nursery while 保育園(の中)で sounds broadly in the nursery.
Other examples of 内{ない}
When used as a noun, 内 is read うち. For example, 内{うち}と外.
Also note that when talking about inside X(location), Xの内{うち} is not used. It should be Xの中. (For non-location, 計算の内{うち}=expected (lit. within calculation)).
I thinks this 内 of 保育園内 emphasize the location of the event. It's no problem 保育園で gramally but maybe 犯人 is not a student of 保育園 in this case, so appending 内 is better expression.
