Twelve-year-old Kurshida drew a helicopter dropping bombs, and the military setting her home on fire and cutting her sleeping niece's throat with a machete.
Thirteen-year-old Nurul Haque drew the military setting homes on fire and stomping on the throat of his five-year-old neighbour.
Eleven-year-old Manzur Ali drew several unimaginably horrific incidents that he says occurred while fleeing his village in Myanmar.
"These children have been through a terrible experience. They are heavily traumatised," says Fatema Khyrunnahar, a child protection officer with Unicef who has helped to set up what the agency calls "child friendly spaces" within the squalor and misery of the Rohingya camps. These are rare spaces where these children can be play with each other and have books read to them.
The term "ethnic cleansing" is defined as an effort to rid an area of an unwanted ethnic group – by displacement, deportation or even killing. "When one-third of the Rohingya population had to flee the country, could you find a better word to describe it?" UN Secretary-General Antonio Guterres told a news conference.
UN High Commissioner of Refugees Filippo Grandi said the world has to help the "deeply traumatised" refugees facing enormous hardship. "They had seen villages burned down, families shot or hacked to death, women and girls brutalised," Grandi said. He called for aid to be "rapidly stepped up" and thanked Bangladesh for keeping its border open.