The 40-year-old actor interacted with children and families in the region, where over 240,000 internally displaced persons reside and receive aid from a UNICEF-supported psychosocial unit, reported People magazine.
"As a father, it is hard for me to imagine how many of these children are caught up in this conflict. During my trip I have heard dreadful stories about children fleeing on foot, leaving everything behind, including the safety of their homes and classrooms," Bloom said.
The actor, who shares six-year-old son Flynn with ex-wife Miranda Kerr, said it was hard to imagine what the children in Niger had endured.
In addition to Niger, the UNICEF goodwill ambassador, also visited the rural commune on the border of Nigeria.