**The US government is concerned it could be implicated in potential war crimes in Yemen because of its support for a Saudi-led coalition air campaign.
Official documents obtained by Reuters news agency show government lawyers advised the US it might be considered a co-belligerent under international law.
The Obama administration has continued to authorise weapons sales to Saudi Arabia despite the warnings last year.
On Saturday, an air strike on a funeral hall in Sanaa killed some 140 people.**
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