[R] EM algorithm on a mixture of two negative binomials?

[francogrex]

Dear R stat experts,

I am looking for an R function/code that can perform the EM algorithm to
estimate the parameters of a mixture of two negative binomial distributions.
I know that there are functions written that use the EM to estimate a
mixture of normal distributions and also within the package "mclust", but I
haven't seen any for other mixture density, like the negative binomial. I'm
not good enough to write such a function myself yet. Can you guide me to
something already done? Thanks.
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