About 3,500 slaves held by Islamic State in Iraq - U.N.
Those being held are predominantly women and children from Yezidi community
Somalia received Saudi aid the day it cut ties with Iran - document
Somalia appears to have received Saudi pledge of $50 mln in aid
FACTBOX - Key facts about the Ebola epidemic
Here are some key facts and figures about the epidemic, which killed more than 11,300 people out of 28,600 cases
Danger ahead: migration, climate top risks for Davos leaders
Experts say we live in an increasingly dangerous world, with political, economic and environmental threats piling up
Record number of asylum seekers in UK are destitute - Red Cross
Red Cross supported 9,000 destitute refugees last year, and planned legislation could plunge thousands more into poverty
One in four children in conflict zones "risk losing their future" - UNICEF
South Sudan has the largest proportion of children out of school, followed by Niger, Sudan and Afghanistan
INTERVIEW-Refugees, warmongers and bloodshed targeted in first global aid summit
Aid workers demand warring parties abide by humanitarian laws that protect civilians and allow aid to reach them
WHO calls for access to Yemen's "virtually besieged" city
Trucks carrying oxygen, medicines and medical supplies have not been able to enter Taiz since mid-December