gao is located in northern mali. it has become a major crossroads for migrants wanted to reach europe. human trafficking is a lucrative business. yehia and issa have years of experience in this dubious trade. two young men have just arrived from southern mali. yehia and issa advise them to beware of the criminal gangs. the gang members have no scruples and will steal all their valuables, possibly even cut their throats. karamu sibe: what can we do? all we can do is to pray that things go well. i know there are people who only want to rip us off and cheat us. reporter: the newcomers are reluctant to place their trust in yehia and issa. they choose instead to have a look around gao. the traffickers herd migrants into a so-called ghetto, a barracks-like building, where they stay until they can pay the 50 to 100 euros to travel on. this is where we first met bilal from sierra leone. he's the one with the plaid shirt. but before we can speak to him, the ghetto bosses arrive and break off the interview. they refuse our req