Parents whose daughters have been released wore white tabards over their clothes at the two-hour ceremony, while those whose daughters are still being held wore black.
The Country Director of AAN, Ene Obi, said in a statement, "The FG and the military should adopt intelligence, power and negotiation as deployed for the release of the Dapchi girls, to bring back the remaining 113 missing Chibok girls and the remaining Dapchi girl, Leah Shuaibu".
"We need to know if they are alive or dead".
"They are only trying to discourage the government".
"The fourth anniversary of the Chibok abduction reminds us that children in northeastern Nigeria continue to come under attack on a shocking scale".
Nigeria's president in 2014, Goodluck Jonathan, was heavily criticized for his response to the Chibok abduction.
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He continued: "But the truth is it's easy for it to take over everything in your life and you can't just let that happen". His youthful appearance, commitment to physical fitness, and family portrait made him a poster boy for Midwestern values.
President Muhammadu Buhari has offered reasons why the remaining girls abducted by terrorists from Government Girls Secondary School, Chibok, Borno State, in 2014, have not been set free.
The journalist had then warned the government to stop negotiating for girls that are no longer alive or demand proof from Boko Haram that the girls are alive.
Ahmad Saldika, Nigerian journalist popular for investigating the working of Boko Haram group has revealed that only 15 out of the 113 Chibok Girls believed to be in the custody of insurgent group are still alive.
Since the current insurgency started in 2009, Boko Haram has killed tens of thousands and displaced 2.3 million from their homes and was ranked as the world's deadliest terror group by the Global Terrorism Index in 2015.
This is even as the president Buhari assured the parents of the school girls that were abducted from Government Girls Secondary School Chibok, Borno State, that "their daughters will never be forgotten or abandoned to their fate, despite four long years since they were taken away by terrorists". But while there have been clear army gains, security threats remain. In February Boko Haram had kidnapped 100 school children.
The latest report was the one that alleged that only about five out of 100 remaining girls still in the captivity of Boko Haram were alife.
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Another activist, Habiba Balogun, said she hoped that would happen after almost nine years of violence that has left at least 20,000 dead and made more than 2.6 million homeless.
Some Dapchi parents were in Chibok on Saturday in a show of solidarity.
Boko Haram has used kidnapping as a weapon of war during the conflict, seizing women and girls to act as sex slaves or suicide bombers, and men and boys to fight.
"Every time, they are always saying the girls have been killed, we continue to secure their release just like we did recently".
"These repeated attacks against children in schools are unconscionable", said UNICEF Representative in Nigeria Mohamed Malick Fall.
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