How many suspects related to the investigation are currently in custody in Yemen?

The correct answer indicates that currently, there are 6 suspects in custody related to the investigation in Yemen. This number is significant in understanding the scope of the investigation, as it suggests an ongoing effort to address the issues at hand. The detention of 6 suspects implies that authorities are actively working on gathering information, understanding the networks involved, and potentially preventing further incidents associated with the investigation. The number reflects a critical aspect of law enforcement's strategy in tackling crime and maintaining security in the region, which may involve various complexities based on the specific context of the investigation being referred to.