This is the 15852nd most frequent Turkish word.
tutuklandığını
"That (someone) was arrested."
The word "tutuklandığını" here is used with the verb "öğrendik" (we learned) to report an indirect fact or event.
Polisin açıklamasına göre, zanlının dün gece tutuklandığını öğrendik.
According to the police statement, we learned that the suspect was arrested last night.
The phrase "tutuklandığını" operates in conjunction with "okudum" (I read) to convey an understanding relayed from a written source.
Gazetelerde, ünlü bir sanatçının tutuklandığını okudum.
I read in the newspapers that a famous artist was arrested.
In this sentence, "tutuklandığını" connects with "bildirdi" (reported) to indicate a piece of information provided during a broadcast.