A child suicide bomber blew himself up in a market in northeast Nigeria Friday, killing at least 10 people, witnesses said, the latest bloodshed to hit the region, which is plagued by Islamist violence.

They said a huge blast erupted at around midday (1100 GMT) in the crowded market in Gombi in Adamawa state, one of the worst-hit in the seven-year Boko Haram insurgency.

At least 13 people were killed on Wednesday when three suicide bombers blew themselves up in the northeast Nigerian town of Chibok, where Boko Haram kidnapped more than 200 schoolgirls.

The blasts happened at about midday (1100 GMT) as the remote town in Borno state was packed with traders from surrounding villages for the weekly market, Chibok elder Ayuba Chibok told AFP.

Boko Haram Islamists killed a civilian and torched his house during a raid on a village in the northeastern Nigerian state of Yobe, a police spokesman said on Monday.

Traveling in all-terrain vans, they raided Babban Gida village around 01:00 am (GMT) Sunday and fought a gunbattle with soldiers.

U.N. human rights experts on Friday urged Nigeria to increase its efforts to help women and children after they have been freed from captivity by Boko Haram in the country's conflict-riven northeast.

After a five-day visit to the region, three special rapporteurs said there was an "urgent and pressing need for effective measures to address stigma, ostracism and rejection of women and children" as a result of their captivity.

Kinsmen of a former rebel leader in Nigeria's oil-producing south on Friday accused the government of conducting a witch-hunt after he was charged with theft and money laundering.

A federal high court in Lagos last week ordered the arrest of Government Ekpemupolo on accusations that he stole more than $175 million (161 million euros) between 2012 and last year.

At least six Niger soldiers were killed on patrol when their vehicle hit a mine in the Diffa border region used by neighboring Nigeria's Boko Haram militants, local authorities and media said on Monday.

"An army vehicle ran over a mine causing deaths and injuries but we do not have the exact figures," Abari El Hadj Daouda, the mayor of the town of Kabalewa where the incident happened on Saturday, told AFP.

Nigeria's Boko Haram Islamists have killed nearly 1,200 people in neighboring Cameroon's far north since 2013, the communications minister in Yaounde said Friday.

Issa Tchiroma Bakary told reporters that the group had staged 315 raids in the border region during this period and carried out 32 suicide bombings.

Officially, there's been no death toll from two days of clashes between Nigerian troops and a Shiite Muslim group in the northern city of Zaria last month.

But talk on the ground is of 300, 400, 600 or more -- a huge number even in a region where at least 17,000 have been killed in Boko Haram's Islamist insurgency since 2009.

A Nigerian Shiite Muslim group on Thursday said more than 700 of its members were unaccounted for, nearly a month after clashes with the army in the northern city of Zaria.

"In our list there are about 730 people, men and women, who are still missing, since that fateful Saturday December 12, 2015," spokesman for the Islamic Movement of Nigeria (IMN), Ibrahim Musa, in an emailed statement.

Hundreds of parents and sympathizers of more than 200 schoolgirls abducted by Boko Haram Islamists in northeast Nigeria met President Muhammadu Buhari on Thursday to renew calls for their release.

The 300 or so marchers, many of them crying, trekked through the capital Abuja before being taken in buses for an audience with Buhari at his official residence.