Four worshippers were killed in a suicide bombing at a mosque in northern Cameroon on Monday, a security source said, five days after a similar attack left 12 people dead.

Four worshippers were killed in a suicide bombing at a mosque in northern Cameroon on Monday, a security source said, five days after a similar attack left 12 people dead.

Monday's blast hit the village of Nguetchewe in Cameroon's Far North region, in an area near the border with Nigeria regularly targeted by Boko Haram Takfiris.

"The toll of this attack is four dead and two injured," the source, who was at the scene of the attack, told AFP.

A source close to regional authorities confirmed that a deadly attack had taken place in Nguetchewe, but was unable to provide details.

The security source said the attack took place around 6:00 am (0500 GMT) just as morning prayers were ending.

"The suicide bomber, a young boy, arrived in the village by foot," the source said, adding that a witness had noticed his behavior seemed suspicious and had tried to intercept him.

"The bomber ran towards the mosque, where he set off the explosives he was carrying with him."

Cameroonian troops are at the scene of the attack, the source said.

It is the second deadly blast to hit the Far North in less than a week, following a bombing at a mosque in Kolofata district during morning prayers last Wednesday.