(CNN) One month after Cyclone Idai ripped through Mozambique and killed at least 750 people, children there are showing signs of severe psychological stress, the charity Save the Children has warned.

After speaking with families at a center for internally displaced people in the port city of Beira, the charity said it was concerned that the "urgent and long-term needs of children continue to grow," following the cyclone.

During Save the Children's investigation, the agency asked children to draw their homes before and after the cyclone and to describe what they had witnessed. In their pictures, children drew devastating images of adults and children crying and people drowning in floodwaters. The charity used only the first names of the children and adults in its study.

Ten-year-old Faizal drew his home before and after Cyclone Idai hit his community.

Ten-year-old Faizal's drawings showed a stark difference of his home before and after the cyclone.

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