The ministry of the/interior of ......

[Sb70012]

1. The Ministry of Interior of the Republic of Iran
2. The Ministry of the Interior of France

Hello,
I am a little bit confused. On the Internet, in one wikipedia article "the" has been used before "interior" in #2 but in #1 article "the" has not been used before "interior". Why?

Thank you.
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[Beeesneees]

It's impossible to say for certain from such small snippets taken out of context, but both forms are in use.
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