The UN says it has received reports that guards fired on migrants who tried to flee air strikes on a detention centre near Libya’s capital Tripoli on Tuesday.
The UN says it believes at least 53 migrants died and 130 were hurt in the air strikes on the Tajoura centre.
Nine Nigerians have been confirmed dead in the airstrike, which struck a Libyan Migrant Detention Camp in Tripoli
The foreign ministry in its statement in Abuja on Thursday, said the casualty figure were preliminary findings by a diplomatic mission that visited the hangar in the suburb of Tajoura.
“A diplomatic mission confirmed that nine Nigerian men lost their lives. The mission has identified and taken custody of three women, one man, a toddler and a 10-year-old boy,” the statement said.
UN High Commissioner for Human Rights Michelle Bachelet has said the air strikes could constitute a war crime.
The government and an opposing militia have blamed each other for the attack.
Thousands of migrants trying to reach Europe, many of them sub-Saharan Africans, are being held in Libyan detention camps.
Libya has been torn by violence and division since long-time ruler Muammar Gaddafi was deposed and killed in 2011.
A recent upsurge in violence began in April when the self-styled Libyan National Army (LNA), commanded by Gen Khalifa Haftar, launched an offensive against the UN-backed Government of National Accord (GNA), led by PM Fayez al-Sarraj.