Delete message from a specific zone

[leadsmkt]

Hello,
I would like to delete all message from a specific queue on MongoDb.
Could you explain me th way to do it.
On mongodb, i see the zone-mta database, with these collections "suppressionlist", "zone-queue", mails.chunk" and "mail.file".

Can you tell me which command i have to run to delete all message from queue "xxx".
Thank you