Chad has executed at least 10 members of the Nigeria-based Boko Haram Takfiri militant group after they were found guilty of involvement in a series of deadly bomb attacks in the capital, N'Djamena.

An unnamed Chadian judicial source told AFP that the militants were executed by firing squad near the capital city on Saturday.

"They were executed this morning on a shooting ground north of N'Djamena," the sources said.

The militants were sentenced to death for crimes including murder and the use of explosives.

Sources say some of the executed include notorious regional Boko Haram commanders who masterminded the deadly bombings in the Chadian capital.

This came after a series of deadly bomb attacks in N'Djamena claimed dozens of lives in June and July.

On June 15, two bomb attacks at a police academy and the city’s main police station killed nearly 40 people. Boko Haram claimed responsibility. Also on July 11, a bomber attacked a busy market outside the city's main market, killing more than a dozen people.

Chad has been a major military ally to Nigeria in the fight against Boko Haram, whose leader has publicly threatened the Chadian president with retaliation.

The threats have prompted Chadian President Idriss Deby to introduce a series of tough new anti-terror laws.

Chad is a leading country in a regional 8,700-strong military task force fighting the militant group.

Back in February, four nations of the Lake Chad Basin -- Chad, Cameroon, Niger, and Nigeria -- launched a campaign, together with a contingent from Benin, to confront the threat from Boko Haram militants in the region.

Boko Haram has pledged allegiance to the Takfiri Daesh terrorist group, which mainly operates in Syria and Iraq. The Nigerian militant group has intensified its campaign of terror since President Mohammadu Buhari came to power on May 29.

Boko Haram says its main objective is to overthrow the Nigerian government. The group has claimed responsibility for a number of deadly shooting attacks and bombings in Nigeria since the beginning of their militancy in 2009 that has so far claimed the lives of about 17,000 people.