After losing her husband, two young sons and her home, Noor Banu (pictured below) thought she had seen the worst of life.
She made the perilous journey from her village in Myanmar’s Rakhine State to the refugee camps in Bangladesh in 2017, with nothing except her four surviving boys.
Banu has approached aid agencies at the camps to seek help in finding Karim, but her hope is fading.
"My son knows the camps very well," she said. "If he was alive, he would have returned to me by now."