Defence Minister Mahamat Sala says more victims might still be buried in rubble after a mine in Tibesti region near Libyan border collapsed on Tuesday.
The state of emergency declared by Chad President Idriss Deby will run for three months in Sila and Ouaddai regions, the president's office said.
Eastern Chad is in the grip of cyclical violence between nomadic camel herders and sedentary farmers from the Ouaddian community.
The Multinational Joint Task Force, comprising soldiers from several African countries, says it has "inflicted the heaviest loss in six months" on Daesh in Lake Chad area.
Mahamat Nouri has also been charged with participation in a criminal conspiracy to commit a crime against humanity, and placed in provisional detention, says a judicial source.
The attack was carried out in Kareto village, 335 kilometres north of the Borno state capital Maiduguri, military officials say.
"Several dozen armed men carried out an attack on the district of Arbinda, shooting several people dead," a local official tells AFP news agency.
Libya's unity government was created at UN-backed talks in 2015, but it has struggled to assert control, while a number of international initiatives since have failed to unite the country.
The Malian prime minister resigned along with his entire government, after criticism over failure to clamp down on deadly violence.
Those killed included 63 suspected terrorists and seven soldiers in clashes following an overnight attack on a military base in Bouhama, according to a military spokesman. Boko Haram has struck inside Chad at least seven times since last year.
The strongman’s rationale for outrightly attempting a supreme hold on power through the Tripoli offensive is interlaced with narratives he thinks will resonate with his embattled people. He may well be mistaken.
At a news conference with his Chadian counterpart Idriss Deby Itno in Ankara, President Recep Tayyip Erdogan said the current trade volume between Chad and Turkey must be increased to $100 million.
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