Forty-three people had hoarding disorder, 31 people had OCD and 33 participants were normal controls.

CNN: STORY HIGHLIGHTS

Two in five knew someone who had self-harmed, two in five knew someone who had panic attacks and one in three knew someone with an eating disorder.

BBC: Girl guides' warning on self-harm

In addition, three public buildings were badly damaged during several hours of disorder, CNN affiliate BFM-TV reported.

CNN: STORY HIGHLIGHTS