U.S. President Barack Obama will welcome King Mohammed VI of Morocco to the White House later this month, officials said Thursday.

The talks on November 22 will highlight Washington's support for Morocco's "democratic and economic" reforms, a White House statement said.

The diplomatic ruckus between Morocco and Algeria over human rights in Western Sahara has revived the historic animosity between North Africa's arch rivals, as regional changes challenge a decades-old status quo.

Analysts say key factors explaining the rising tensions between the neighboring countries, whose differences are rooted in the Western Sahara conflict, include chronic instability in the Sahel region, and a possible leadership change in Algeria next year.

A would-be migrant died Tuesday when he fell while trying with 150 others to scale the border fence separating Morocco from Spain's north African territory of Melilla, Moroccan officials said.

The incident, in which another four people were injured, comes a day after 80-100 migrants succeeded in getting across by charging the seven-meter (23-foot) high fence at a point where it had not yet been reinforced.

Scores of migrants entered Spain's north African territory of Melilla Tuesday after storming a border fence, which authorities are busy topping with barbed wire to discourage such assaults, a local official said.

"Between 80 and 100" migrants managed to enter Melilla after charging the seven-meter (23-foot) high fence at dawn at a point where it had not yet been reinforced, the local government spokesman said.

Spain has installed barbed wire on the triple border fence that separates its north African territory of Melilla from Morocco, a key entry point into Europe for illegal migrants.

Barbed wire started being placed on the top of several sections of the seven-meter (23-foot) high fence last week to "reinforce security a bit", a spokesman for government of Melilla said Monday.

Morocco's ambassador to Algiers is to resume work on Monday, after having been recalled in a spat over disputed Western Sahara, a senior Moroccan official said.

"The ambassador has arrived in Algeria and he will resume his duties tomorrow (Monday)," the official told Agence France Presse on Sunday, asking not to be named.

A young Moroccan tore down the Algerian flag from the roof of that country's consulate in Casablanca during a protest Friday over Western Sahara, sparking an angry protest from Algiers.

A video widely circulated on Internet sites in Morocco shows the man climbing the walls of the building to reach the flag.

Algeria said Thursday it considers as "unjustified" a decision by Morocco to recall its ambassador in response to comments by President Abdelaziz Bouteflika about disputed Western Sahara.

The spat follows the latest barbed exchange between the North African neighbors whose decades-old rivalry centers on the disputed territory, annexed by Morocco in 1975 in a move never recognized by the international community.

Amid new tensions over Western Sahara, a U.N. envoy said Wednesday there was still no hope of convening face-to-face talks on the disputed territory between Morocco and pro-independence rebels.

Morocco, which occupies the territory, recalled its ambassador to Algiers as the U.N. Security Council held talks on Western Sahara. Algeria is a key backer of the Polisario Front independence movement.

Morocco on Wednesday decided to recall its ambassador to Algeria over President Abdelaziz Bouteflika's "provocative" comments about the disputed Western Sahara, the foreign ministry said.

"This decision comes after a growing number of provocative and hostile acts by Algeria, towards the kingdom," and particularly a speech by the Algerian head of state at a meeting in Abuja on Monday, the Moroccan ministry said in a statement.