Another deadly suicide attack took the lives of at least 27 people in Africa. A local market on the island of Koulfoua, in Chad was struck, according to the BBC and AP, injuring at least 90.

A Chad police spokesman said three females carried out Saturday’s attack.

The Lake Chad region straddles the borders of Chad, Cameroon, Niger and Nigeria.

The area has been attacked repeatedly by the Boko Haram militant group, and the region is under a state of emergency.

As many as 17,000 people have been killed in the area since 2009, when Boko Haram began fighting authorities in a bid to impose Islamist rule in Northern Nigeria, reports the BBC.

The human rights organization Amnesty International says some 3,500 have been killed in the area so far in 2015. The Boko Haram group “continues to pose significant threat to the lives of civilians on an almost daily basis across northeast Nigeria and to the neighboring countries Cameroon, Chad and Niger,” the group says.

The swampy maze of islands in these border areas has become one of the main targets by Boko Haram because they can hide easily in waterways, reports Reuters.

Another suicide bombing killed three in Chad on Nov. 9.

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