In the countries fighting Boko Haram in the Lake Chad region - Nigeria, Niger, Cameroon and Chad - 27 children have been used in suicide attacks by the armed group in the first three months of the year, UNICEF said in a report and statement.
The statement said five suspects who had been based in Benue state and the Federal Capital Territory were arrested.
Mr. Tony Opuiyo, the spokesperson for the DSS, said that besides the planned attacks on the US and United Kingdom missions, the suspects also planned to attack all Western embassies in Abuja.
They said they had been planning to attack the USA and British embassy in the city of Abuja.
Boko Haram militants are increasingly forcing children to carry out bombings, with the number of attacks since January already almost reaching the total for all of past year, according to a report released by the United Nations children's agency on Wednesday.
A particular case was the arrest on April 10 at Damaturu, Yobe State of Jalo, a Jos resident Guinean and Boko Haram suspect.
WASHINGTON/ABUJA President Donald Trump's administration is pushing forward with plans to sell up to a dozen aircraft to Nigeria's air force for the fight against the extremist group Boko Haram, sources said on Monday, in a deal that could be worth up to $600 million. There must be more that the Government of Nigeria, with the support of the worldwide community, can do to locate and rescue them.
It said 27 children had been used in suicide attacks since the start of the year.
It's been almost three years since Boko Haram abducted more than 250 schoolgirls from the town of Chibok in northern Nigeria, sparking a global outcry and the #BringBackOurGirls campaign.
Government forces are working to identify the body of one of those killed who is believed to be a Boko Haram leader, according to the source.
A senior Nigerian military source in Abuja, Nigeria's capital, confirmed that the sale would go ahead and said it would also involve training, surveillance and military intelligence "to support ... the ongoing insurgency war".
Militant Islamist group Boko Haram is increasingly forcing children to carry out suicide bombing attacks, often drugging them before their missions, Unicef has warned.
Boko Haram had seized 276 pupils from the Government Girls Secondary School in Chibok on the night of April 14, 2014.
The suspect, it added, confessed his involvement in executing the sinister activities of the group. In 2011, Boko Haram attacked the U.N.'s Nigeria headquarters in Abuja with a auto bomb that detonated in the reception area, killing at least 21 people.