National Police Agency
noun
Unlike the 警視庁, who look at things, this is just the police officer (警察) agency. Just the general police agency of the whole country, making them part of the National Police Agency.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
どうして警察庁は犯人の肩を持つような発言をしているんだ？
Why is the National Police Agency making remarks that seem to take the side of the suspect?
今日は、警察庁のウェブサイトを見て、警察庁の歴史について学びました。
Today, I took a look at the National Police Agency's website and learned about its history.
警視庁と警察庁の違いは何ですか？
What’s the difference between the Metropolitan Police Department and the National Police Agency?