YAOUNDE, Cameroon (AP) — A Cameroon official says a 14-year-old suicide bomber has attacked a mosque in Cameroon's north, killing at least four people.

Governor Midjiyawa Bakari said Monday that the boy came early into a town in the Mayo Tsanaga Division in Cameroon's far north and blew himself up during morning prayers. He said a civilian defense group set up to fight Boko Haram extremists prevented more deaths by quickly warning those praying.

Bakari said the attacker likely came from Nigeria, whose extremist Boko Haram group is suspected.

This is the fifth mosque attacked in Cameroon in less than a month.

Boko Haram's six-year insurgency has killed thousands in Nigeria, and across its borders.

Cameroon is one of five countries contributing troops to a regional force intended to wipe out Boko Haram.