Why itachi kill his clan?

Itachi kills his clan before the series starts.

The Konoha Council and Danzo were the ones who told Itachi to kill the Uchiha clan.

Itachi kills the clan cuz the uchiha clan was planning to go against konoha and they were trying to use itachi as there spy THIS IS THE f**** TRUTH

Itachi massacred his clan because he felt they were holding him back because they always put the clan first. Itachi killed his clan not they were holding him back and just to test his ability too.

itachi kills the clan because it was a mission issued out by the ANBU. itachi didn't want to but he was forced. itachi didn't kill sasuke because he wanted to protect sasuke. LOLZ! LRN MORE FROM TasteTheRainbow55! HAGS!

because shisui was spying on itachi for the uchiha clan because the uchiha clan new that itachi was working with the leaf to try to overthrow the uchiha clan plus to get the mongekyou sharingan (you must kill your closest friend to obtain the mongekyou sharingan)

yes, itachi killed all of his clan except sasuke and himself Actually Madara uchiha help itachi kill is whole clan except sasuke and himself. OneManga.com Read mangas they are more accurate then the show.

Itachi was ordered by the Hokage to kill his entire clan because he thought the Uchiha clan was a major threat to him. But only Itachi, the Anbu captain that was also involved in some way, and the Hokage knew that. Itachi was going to kill the entire clan, but couldn't bring himself to kill Sasuke as well, because he had a strong bond with him. So Itachi told Sasuke to hate him and to…

no itachi was ordered by the hokage to kill the uchiha clan but he could not kill his little brother but he beg the hokage to let sasuke live liar itachi would feel guilty of wiping out a whole clan

No. Itachi just wants Sasuke to kill him. That's all.

it was the third hokage- Sarutobi

Itachi was forced to kill the Uchiha clan to save Konoha, but he spared Sasuke because he loved him.

Yes they are brothers. but sasuke wants to kill him because itachi murdered thier clan.

Yeah a guy name Madara Uchiha helped him kill the clan. Madara Uchiha is the leader of the Uchiha clan. You could read about him on narutopedia.

He kills his mother and father (and clan) because he was forced by the Konahagakure elders to either kill his clan or the village would go into another war. On the other hand, Itachi-san's own clan planned against the elders. So Itachi did what he thought was right. ironic kinda... yup yup yuup

Because he found that Itachi was forced to kill all of his clan because of Konoha.

Itachi seeked out madara to help kill his clansmen. this was an agreement so madara wouldn't attack the village if he help itachi kill the clan. itachi did kill uchiha shinsui and gained MS. it is proven and it has no evidence proving otherise. shinsui was the best uchiha next to itachi. the clan knew itachi to be a prodigy but did not know the extent of his power. this can be noted when 3…

it was order from konoha ,uchiha was planning war with konoha

Itachi joins the akutski(?) shortly after the kill his whole clan. There Orochimaru tries to steal itachi's body but fails. Itachi is one of the strongest members.

He already did. After the fight with Itachi, Madara (Tobi) from Akatsuki told him why Itachi killed their clan.

Yes. If fact he's so obsessed that he wants to avenge Itachi and kill Konoha because they forced him to kill the Uchiha Clan.

maybe i think Tobi will

They ordered Itachi Uchiha to murder his entire clan.

He didn't. Those were Danzo and the 2 Advisors.

To take revenge on him for making Itachi kill his own clan.