Algeria has accused Morocco of killing three people in an attack in the disputed region of Western Sahara.
The Algerian foreign ministry said Moroccan forces shelled a commercial convoy on the border between Algeria and Mauritania.
Neither Morocco nor Mauritania have commented on the allegation.
In November, Algiers accused Rabat of killing three Algerian nationals in a similar attack.
Tensions have increased in recent months between the two countries, culminating in Algeria breaking off diplomatic relations last August.
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