Reporting from Cairo — The Yemen summer has seethed with pitched battles and bloodshed, raising fears that the country will tumble into further disarray even as Washington has more than doubled its military and security aid.

Gun fights and explosions break out in spasms across a nation at the dangerous intersection of the Middle East and the Horn of Africa. In the south, an Al Qaeda-linked network has carried out strategic attacks on security targets, while in the north, a rebel group has renewed fighting against rival tribes and government forces.

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