The Tunisian presidency said on Monday it would extend by three months the state of emergency in place since the uprising that toppled former dictator Zine El Abidine Ben Ali in January 2011.

"The president of the republic Moncef Marzouki decided to extend the state of emergency by three months," the official TAP news agency reported.

The United States on Monday called for "maximum restraint" from Egypt's military and condemned the Muslim Brotherhood's calls for an uprising after some 50 people were shot dead at a demonstration.

The White House also said there would be no immediate cutoff in aid to Egypt following the military's ouster of Islamist president Mohammed Morsi, Egypt's first democratically elected leader.

Syria has invited two senior U.N. officials for talks on the purported use of chemical weapons in the country's bloody civil war, Syrian ambassador to the U.N. Bashar Jaafari said Monday.

The offer of talks was made to Swedish scientist Ake Sellstrom, named by the United Nations to investigate the claims, and Angela Kane, U.N. High Representative for Disarmament.

EU foreign policy chief Catherine Ashton on Monday warned all sides in Egypt against "provocation or escalation" as Islamists called for an uprising after the deaths of dozens of loyalists of the country's ousted president.

A spokesperson for Ashton said in a statement that she urged all sides "to move rapidly toward reconciliation" and that "all those who claim legitimacy must ... avoid any provocation or escalation of violence".

Germany called for an independent inquiry into the killing of 42 loyalists of Egypt's ousted president Monday, saying it feared political violence in the country could continue to spiral.

Expressing "shock" about the reports of demonstrators killed while protesting last week's military coup in Cairo, the foreign ministry in Berlin said that all sides must now refrain from bloodshed.

Thousands of people protested in the Yemeni capital on Monday against the Egypt military's ouster of Islamist president Mohammed Morsi, the country's first elected leader in decades.

"We are with legitimacy," read a banner carried by the protesters who marched towards Cairo's embassy in Sanaa, waving Egyptian flags.

Jordan's Muslim Brotherhood on Monday condemned the "massacre" of 51 loyalists of Egypt's ousted Islamist president Mohammed Morsi and urged more demonstrations to restore him.

"We strongly condemn the massacre committed by the neo coupists that has clearly showed the truth about the bloody military coup," the Islamic Action Front (IAF), the political arm of the Muslim Brotherhood, said on its website.

Fifty-one loyalists of Egypt's ousted president were killed Monday while demonstrating against last week's military coup, triggering an Islamist uprising call as the army urged an "end of the sit-in."

The Muslim Brotherhood, which has led demonstrations against Wednesday's overthrow of Islamist president Mohammed Morsi, said its supporters were "massacred" by troops and police during dawn prayers in Cairo.

About 200 Sudanese Islamists demonstrated peacefully outside Egypt's embassy in Khartoum on Monday to support ousted Egyptian president Mohammed Morsi, an Agence France Presse photographer said.

"We are with the legal president of Egypt," read a banner carried by the group, which also waved Egyptian flags.

Tunisia's public prosecutor Monday ordered police to investigate an attack on 19 actors by Salafist Muslims, while they decided whether to charge the artists with alleged "indecency", a lawyer for the drama group said.

"The public prosecutor decided ...to allow the investigation to progress so that police officers could hear the artists' statements as victims," their lawyer Ghazi Mrabet said.