Via a South African newspaper website an article from Mozambique itself, referring to a study (see next paragraph) and the article has more background facts - so worth a read.
Link:https://www.dailymaverick.co.za/arti...mpression=true

Link to the study, which is translated into English and uses the title:
Al Shabaab Mozambique are marginalized youth that create instability for illicit trade of wood, ivory and rubies of their leaders
Link:http://www.verdade.co.mz/tema-de-fundo/35/65831