The United Nations Children's Fund (Unicef) on Tuesday expressed concern about the safety of migrant children held in detention centres in the Libyan capital Tripoli.

The safety and well-being of at least 1,000 women and children, including five unaccompanied children and at least 30 infants held in detention centres in Tripoli, is at immediate risk, Unicef said in a statement, according to Xinhua.

Around 751 women and 255 children were among the thousands of migrants and asylum seekers caught up in recent mass arrests carried out by the Libyan authorities in different parts of the capital, Unicef said.

"Migrant and refugee children in Libya continue to face grave child rights violations, including arbitrary detention," said Cristina Brugiolo, acting Unicef special representative to Libya.

Unicef and other humanitarian actors urged Libyan authorities to protect children and prevent their separation from their parents, caregivers and families.

Unicef also called for the immediate release of all children in detention centres across Libya.

Migrants wait outside the UN High Commissioner for Refugees (UNHCR) office in Tripoli, Libya

"Unicef stands ready with partners to provide technical support, including alternative care arrangements for the detained children," Brugiolo said.

Libya has been suffering insecurity and chaos since the fall of the late leader Muammar Gaddafi in 2011, making the North African country a preferred point of departure for illegal immigrants who want to cross the Mediterranean Sea to European shores.

- Bernama