Around 70 sub-Saharan African migrants crossed the razor-wire-topped fence separating northern Morocco from the Spanish enclave of Ceuta, leaving 14 people hospitalised, the Red Cross said.
One in five children in sub-Saharan Africa, or 148 million, will be living on less than $1.90 a day in 2030.
This is some of the most intense Mediterranean migrant traffic of the year.
The plight of migrants
The IOM said 40,000 migrants worldwide are believed to have drowned since 2000.
The UN Refugee Agency says most of the deaths have been in the past three months.
A boat carrying mostly sub-Saharan African migrants sank off Libya's coast east of Tripoli.
