MAIDUGURI, Nigeria (Reuters) - Boko Haram militants killed at least 30 fishermen in raids on communities around Lake Chad in northeastern Nigeria, the governor of Borno state, residents and military sources said on Tuesday.

The raids are part of renewed attacks by the militant Islamist group which, prior to the latest attacks, have led to at least 113 people being killed by insurgents since June 1.

Last month members of an oil prospecting team were kidnapped in the restive Lake Chad Basin region, prompting a rescue bid that left at least 37 dead including members of the team.

It was carried out by a Boko Haram faction allied to Islamic State which has been active around Lake Chad.

Kashim Shettima, governor of Borno state which is at the epicenter of the insurgency, told journalists that Boko Haram militants had attacked and killed over 30 people in different villages in the latest attacks.

Residents and military sources said the militants ambushed fishermen in a series of raids between Saturday and Monday at villages near the northeast Nigerian border town of Baga.

Baga is at Nigeria’s border with Chad, Niger and Cameroon and in 2015 was the site of fierce fighting between the insurgents and Nigerian troops.

The Boko Haram insurgency, aimed at creating an Islamic state in northeast Nigeria, has killed 20,000 people and forced some 2.7 million to flee their homes in the last eight years.