Mauritania and Algeria urge Western Sahara ceasefire be upheld
In a statement, Maruitania's foreign ministry called on "all parties to show restraint" and invited "all protagonists to work towards the preservation of the ceasefire".
Algeria on Friday "strongly" condemned "serious violations" of the ceasefire.
"Algeria calls on both parties, the Kingdom of Morocco and the Polisario Front, to show a sense of responsibility and restraint," the foreign ministry of Algeria, which backs the Polisario pro-independence movement, said in a statement.
Rabat said its troops would "put a stop to the blockade" of trucks travelling between Moroccan-controlled areas of the disputed territory and neighbouring Mauritania, and "restore free circulation of civilian and commercial traffic."
The Polisario Front warned on Monday that it would regard a three-decade-old ceasefire with Morocco as over if Rabat moved troops or civilians into the buffer zone.
"War has started, the Moroccan side has liquidated the ceasefire," senior Polisario official Mohamed Salem Ould Salek told AFP, describing the action by Rabat as an "aggression".
"Sahrawi troops are engaged in legitimate self-defence and are responding to the Moroccan troops," said Ould Salek, who serves as foreign minister of the Polisario-declared Sahrawi Arab Democratic Republic.