DAKAR, Senegal (AP) — A landslide last week collapsed several tunnels at a major coltan mine in eastern Congo, leaving at least 200 people dead in the rebel-controlled site. The collapse occurred on Wednesday at the Rubaya mines, controlled by the Rwanda-backed M23 rebels, after heavy rains caused several hand-dug tunnels in the unregulated mine to cave in, according to the regional governor’s spokesperson. The M23 rebels and the Congolese government traded accusations over responsibility as