Suspected Boko Haram militants kidnapped eight more girls from Borno State on Sunday, three weeks after the group seized more than 200 girls from a school in Chibok, also in Borno State.
The abducted girls, aged 12 to 15, were taken from the village of Warabe Sunday night, but the news took days to emerge due to poor communications in the area, reports say.
Warabe is close to the notorious Sambisa forest where the girls taken earlier from Chibok are believed to be held.
Boko Haram claimed responsibility for the Chibok abductions on Monday amid growing international anger. In a video released Monday, Boko Haram leader, Abubakar Shekau, threatened to sell off the abducted girls.
The Nigerian government's handling of the kidnapping in Chibok has fuelled public fury.
The United States said on Monday the abductions by Boko Haram was an "outrage". The United Kingdom has offered what it called "practical help" to help rescue the Chibok girls.
Foreign Minister, William Hague, did not give details of the offer being made to the Nigerian government.
"We are offering practical help," Mr. Hague said Tuesday. "What has happened here... the actions of Boko Haram to use girls as the spoils of war, the spoils of terrorism, is disgusting. It is immoral," he said.
There are conflicting figures of the exact number of girls taken from Chibok with some officials saying as much as 276 remain missing.
One resident of Warabe quoted by Reuters news agency said armed men in military fatigues attacked the village late at night Sunday. He said the attackers were entering houses and ordering people out.
The militants made away with the girls along with looted animals and food, the report says.
Meanwhile the United Nations has warned the extremist Islamist Boko Haram against selling the girls they took from Chibok, saying there will be consequences.
"We warn the perpetrators that there is an absolute prohibition against slavery and sexual slavery in international law. These can under certain circumstances constitute crimes against humanity," U.N. human rights spokesman, Rupert Colville, said at a news briefing in Geneva, Switzerland.
"That means anyone responsible can be arrested, charged, prosecuted, and jailed at any time in the future. So just because they think they are safe now, they won't necessarily be in two years, five years or 10 years time," he said.