He added that security measures were being adopted due to fears of fresh attacks inside Cameroon during the Christmas holidays.

The source, who requested anonymity, told The Anadolu Agency that Cameroon had sent army reinforcements to the Extreme North region and stepped up border patrols.

He added that three Boko Haram members had been arrested on Tuesday after hiding out for some time in Cameroon.

"A Cameroonian man in his 30s was also arrested on the same day on suspicion of collaborating with Boko Haram," the source said.

He said the arrested man had helped the militant group repaint stolen cars used for crossing the border.

In recent months, the Cameroonian authorities have tried to understand how Boko Haram had managed to enter its territory from Nigeria without being noticed.

The border region has remained tense for some time now due to repeated Boko Haram attacks in the area.