It is revealed in the hadiths that the system of the dajjal (antichrist) will cause strife and slaughter

There have been no great strife than that of the antichrist, since the day of the creation of the Prophet Adam (as) to the Last Hour. (Al-Barzanji, Al-Isha'ah li-ashrat al-sa'ah, 8th. Editioni, p. 225)

Strife will be seen, and more will follow. Such a level of strife will come that the first will spur the last to clashes of swords, and after this there will be such strife that what is forbidden is regarded as lawful. Then the spiritual leadership will come to Hazrat Mahdi (as), the most auspicious individual on Earth, while he is sitting at home. (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 26)

Strife will be seen after me. There is no escape from that strife. There will be war and flight. Then there will be even fiercer strife. Just when people say it is finished, it will flare up again even stronger. There will be no Muslim whose home corruption does not touch and enter. This will continue until a man from my line [Hazrat Mahdi (as)] appears…” (Nuaim Ibn Hammad, vr, 75b; Saban Dogen, Mehdi ve Deccal [The Mahdi and the Antichrist], Genclik Publishing, 2nd edition),

There are days of anarchy and disorder very close to the Judgment Day. (As-Suyuti, Al Jami As Sagir; Ahmad ibn Hanbal, Musnad)

Mahdi (as) will not appear until innocent people are slaughtered and the dwellers in the earth and sky can no longer bear the killing... (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 37)

Most painful situations and grievous sights will be seen. Strife will go on and on. It will kill mothers, fathers, daughters, men, and everyone. Among these will be strife, violence, destruction, and looting. People will say it has ended, but it will still go on.(Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman , p. 36)

Abu Hurayra relates: "Our Prophet (saas) said that: 'People will see such days that the killer will not know why he kills, nor the innocent why they are slain.' " (Muslim, Kitab al-Fitan: 56, (2908))

The Judgment Day will not come unless one murders his / her sibling. (Muhammad ibn ‘Abd al-Rasul Barzanji, Al-Isha‘ah li-ashrat al-sa‘ah, p. 141)

In the near future, there will be people who will cause strife and conflict. (Ash-Sharani, Mukhtasar Tazkirah al-Qurtubi, p. 376, no. 685)

Strifes will follow one another in the near future. Then, there will be other strifes and the ones following them. (Ash-Sharani, Mukhtasar Tazkirah al-Qurtubi, p. 374, no. 684)

... There will be much strife, disorder and insurrection (in those times) and people will kill one another. People kill themselves, and mischief prevails all over the world. (Ibn al-Athir, al-Nihayah, vol.1, p. 131)

A time will come when people's faces are the faces of human beings, but their hearts are the hearts of evil. They are shedders of blood and do not avoid offensive acts. If you adhere to them, they protect you. If you trust them, they act treacherously. Their children are immoral, and their teenagers are unabashed. Their elderly, on the other hand, do not enjoin the good or forbid the evil. One kind of corruption [fitna] will surface, from which no party will be able to protect itself, and spread immediately in all directions. This situation will persist until someone comes and says: "O people, from now on your leader is the Mahdi." (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 23.)

Before Hazrat Mahdi (as) widepread slaughter will break out and a great strife will be seen. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 37)

Hazrat Mahdi (as), one of my children, comes into being, by the blessing of Allah, upon the approach of the Day of Judgment; the weakening of the believers' hearts because of death, hunger, strife and the disappearance of the Sunnah; and the emergence of innovations and the loss of means by which to enjoin the right and forbid the wrong. His justice and prosperity will ease the believers' hearts, and friendship and love will settle between the non-Arab and the Arab nations. (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 66)

At a time when the world will be in tumult and cruelty, corruption will appear, people will be attacked, the old will not have mercy on the young, and the young will not show respect to the old, Allah will send someone [Hazrat Mahdi (as)] to eradicate hostility, conquer the castles of perversion, uphold faith in the End Times just as I upheld it formerly; someone who will fill this Earth with justice where violence prevailed before. (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 12)

The Hour [Last Day] will not be established until murders increase.  (Ash-Sharani, Mukhtasar Tazkirah al-Qurtubi, p. 468)

I swear to Allah, Who endowed me with justice, that after me there will be a period of gap among my people. At that time, everyone will ask for possessions without considering whether they are halal [lawful], blood will shed, and poems will be held as dear as the Qur'an. (Ad-Daylami)

"… when people are in disputes and social upheaval. … " (Ahmad Diya ad-Din al-Kamushkhanawi, Ramuz al-Ahadith, 7/7)