Attacks on Hazaras in Kabul and Mazar i Sharif have direct connection to attacks on Hazaras in Pakistan.

A letter from terrorist group Lashkar-e-Jhangvi
Text of the letter:
All Shias are wajib-ul-qatl (worthy of killing). We will rid Pakistan of [this] unclean people. Pakistan means land of the pure, and the Shias have no right to be here. We have the fatwa and signatures of the revered ulema in which the Shias have been declared kaafir [infidel]*. Just as our fighters have waged a successful jihad against the Shia-Hazaras in Afghanistan, our mission [in Pakistan] is the abolition of this impure sect and people, the Shias and the Shia-Hazaras, from every city, every village, every nook and corner of Pakistan. Like in the past, [our] successful Jihad against the Hazaras in Pakistan and, in particular, in Quetta is ongoing and will continue [in the future]. We will make Pakistan their graveyard — their houses will be destroyed by bombs and suicide bombers. We will only rest when we fly the flag of true Islam on this land. Our fighters and suicide bombers have [already] successfully operated in Parachinar**, and are awaiting orders to operate across Pakistan. Jihad against the Shia-Hazaras has now become our duty. Our suicide bombers have successfully operated in Hazara Town on May 6, and now our next target is your houses in Alamdar Road***. As long as our innocent friends aren’t freed [from incarceration], we will continue our operations.
The Principal, Lashkar-e-Jhangvi Pakistan.
Translated by Ahmad Shoja