A Moroccan official however claimed the situation is normal
Pro-independence rebels fighting Morocco over the disputed territory of Western Sahara on Sunday vowed a military escalation, hours after launching an overnight attack.
The Polisario Front said they had bombarded the Morocco-controlled area of Guerguerat, a crossing point between Western Sahara and Mauritania in a UN-patrolled buffer zone.
AFP could not obtain independent confirmation of the reported rocket strikes, or any possible casualties, from the remote desert region that is largely off-limits to journalists.
"The war will continue and escalate," senior Polisario security official Sidi Ould Loukal told AFP by phone. "All positions of the Moroccan army are targets of this war."
A Moroccan official however told AFP there had only been "harassing fire," labelled the attack claim part of a "propaganda war" and insisted "the situation is normal."
Moroccan TV channel 2M showed images of trucks in the Guerguerat area and reported the situation was "normal" on early Sunday.
Western Sahara is a former Spanish colony contested since the 1970s between Morocco, which controls three-quarters of it, and the Algeria-backed Polisario Front, which demands independence for what it calls the Sahrawi Arab Democratic Republic.
A UN-backed political process has been suspended since March 2019, and the two sides remain separated by a 2,700-kilometres sand barrier.
Tensions rose sharply when Morocco on November 13 sent troops into the buffer zone to reopen the only road leading from Morocco to Mauritania and the rest of West Africa after separatists had blocked it the previous month.
The Polisario responded by declaring the 1991 ceasefire null and void, arguing the road had not existed when the truce was signed and was therefore illegal.
The two sides are reported to have since exchanged regular fire along the demarcation line.
The pro-independence rebels overnight launched four rockets toward Guerguerat, the Sahrawi press agency SPS said, also reporting attacks along the security barrier.
The Guerguerat road crossing had been "closed" and the situation there was "chaotic," said Ould Oukal, secretary-general of the Sahrawi ministry of security.
"This is only the beginning," he said. "It is a warning to the users of this road and this land. The whole territory of Western Sahara is a war zone and is not safe."
The senior Moroccan official contacted by AFP in Rabat however said: "There was harassing fire near the area of Guerguerat, but it did not affect the trunk road, traffic was not disrupted.”
"It's been part of a cycle of harassment for more than three months," he said.
"There is a desire to create a propaganda war, a media war, on the existence of a war in the Sahara" but "the situation is normal," he said.
The UN-backed ceasefire deal was meant to lead to a referendum on self-determination for the Britain-sized territory, home to about one million people.
Morocco has offered autonomy but maintains the territory is a sovereign part of the kingdom.
Rabat has won the recognition of its claim to sovereignty over the entire disputed territory from numerous countries that have opened consulates in Western Sahara.
Former US President Donald Trump late last year also backed Morocco, breaking decades of precedent, in exchange for Rabat normalizing relations with Israel.
The Polisario Front, which fought a war for independence from Morocco from 1975 to 1991, has said it is still willing to join UN talks on the territory's future -- but would not lay down its arms.
"In the past, we put all our trust in the international community and definitively ended our armed struggle," Ould Loukal said on Tuesday.
"We have waited 30 years -- 30 years of broken promises, prevarication, and untenable waiting."
Ould Loukal insisted the group was "open to any mediation. But at the same time, we will keep up the armed struggle, based on past experiences."