Members of a civilian defense group say Boko Haram extremists have killed up to 28 people during attacks on remote farming and fishing villages in northeast Nigeria.

A total of 24 people were killed in an attack Tuesday night in Marfunudi, according to village resident Abubakar Jojo. Te town is roughly 50 miles from the Borno state capital of Maiduguri. Jojo said Friday that many of the victims had their throats slit. Witnesses say the extremists also attacked the fishing village of Kafa on Thursday, killing four people.

More than 1,000 people have been killed since President Muhammadu Buhari was elected in March with a pledge to annihilate the militants, whose 6-year-old uprising has killed a total of 20,000 people. Nearly 2 million have been driven from their homes.