Using a large blue vessel, the brigade has been locating migrants at sea and taking them back to Libya. We were detained for 20 days by the TBZ brigade,” he said. To do so, he sought out a boat trip that was set to leave from the Lebanese city of Tripoli. A few days into their voyage, somewhere between Cyprus and Greece, the migrants on board noticed a plane surveilling them. When they arrived in Libya, the members of the TBZ brigade started to select people randomly.