Fifteen people were killed and 130 injured in a series of suicide attacks on Lake Chad's Koulfoua island involving four bombers, Chad's state TV said on Saturday.
"The provisional death toll is 19 dead, including the four kamikazes, and 130 injured," the brief statement said.
The death toll given earlier in the day by security sources was higher at around 30.
Gen. Banyaman Cossingar, Chad gendarmerie director general, confirmed the attack, saying Nigeria's Boko Haram group is suspected.
The Lake Chad region, which straddles the borders of Chad, Cameroon, Niger and Nigeria, has been regularly targeted by the fighters. Chad's government has already imposed a state of emergency in the area.
Boko Haram, the Nigerian group whose 6-year uprising has killed some 20,000 people, stepped up attacks this year in neighboring Chad, Niger and Cameroon after those countries agreed to help fight the armed group.
The Associated Press
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