Agreed, the missionaries I have known generally take some cash; however, most funds are funneled through an account of the organization supporting them. And they never have that kind of money--that's why we know them. They need support to provide services.
Were you able to capture any identifying info on the individuals or the organization they were supposed to be associated with? If so, this might warrant a call to the Joint Terrorism Task Force.
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Life without Jesus is like an unsharpened pencil - it has no point.