Belgium on Wednesday offered to host an office of Syria's opposition National Coalition in Brussels, headquarters of both the European Union and NATO.

Speaking from Morocco where he was attending a meeting of the Friends of Syria group, Foreign Minister Didier Reynders told the national Belga news agency that "I have proposed to the (Syrian) coalition that it organise a representation in Brussels."

The opposition National Coalition, newly recognized by Washington as the legitimate representative of the Syrian people, on Wednesday urged the U.S. to review its blacklisting of the jihadist Al-Nusra Front.

"The decision to blacklist one of the groups fighting the regime as a terrorist organization must be re-examined," the bloc's leader, Ahmed Moaz al-Khatib, said at a meeting in Morocco of the Friends of Syria group that includes the United States.

Tunisian security forces have lost track of an armed group that killed a policeman in the border near Algeria this week, a security official said on Wednesday.

"The search operation was moved to Mount Chaambi on the basis of unconfirmed information about the presence of armed men" in the area, the site of the attack, said the official from the Kasserine region.

Arab and Western countries opposed to President Bashar Assad are to recognize an opposition bloc as the sole representative of Syrians, according to a statement seen by Agence France Presse on Wednesday.

The declaration to be issued Wednesday at a "Friends of Syria" meeting in Morocco coincides with battlefield gains by jihadists fighting Assad's forces, and a rapidly deteriorating refugee situation as winter sets in.

A key mainstream Syrian rebel commander condemned on Wednesday a US decision to blacklist the jihadist Al-Nusra Front as a "terrorist organization."

"We reject this decision," Colonel Abdel Jabbar al-Okaidi, head of the Free Syrian Army in the battleground northern province of Aleppo, told Agence France Presse.

At least one person was killed and several people were wounded by two bomb blasts in the Syrian capital and a southeastern suburb of the city on Wednesday, the SANA state news agency said.

"Terrorists blew up two bombs laden with explosives behind the Palace of Justice in the (central) Qanawat district of Damascus," said the agency, adding that one person was wounded there.

Shootings and bombings killed six Iraqi security forces members and an academic on Wednesday, while an inmate detonated explosives in a Baghdad prison in an attempted suicide attack, officials said.

Gunmen killed four police near Fallujah, west of Baghdad, a police captain and a medical source said, while gunmen in Mahmudiyah, south of the capital, shot intelligence service Captain Muntasser Abdul Rizzaq, according to an interior ministry official.

Egypt's referendum on a controversial draft constitution will now take place on two separate dates, Egyptian state television said on Wednesday.

The electoral commission announced that the vote, initially set only for December 15, will take place both on Saturday and a week later on December 22, Nile TV said.

Vandals sprayed anti-Christian graffiti on a monastery and a Christian cemetery in Jerusalem overnight, in two apparent "price-tag" attacks, police told Agence France Presse on Wednesday.

"Overnight, graffiti was sprayed on the gates of the entrance of the Armenian cemetery reading 'Jesus is a son of a bitch' in Hebrew, and on a monastery belonging to the Greek Orthodox saying the same thing," police spokeswoman Luba Samri said.

President Barack Obama proclaimed Syria's newly reframed opposition as the "legitimate" representative of the nation's people Tuesday, in the most significant U.S. intervention in a brutal civil war.

As Washington cranked up pressure on beleaguered President Bashar Assad, the Obama administration also blacklisted the al-Qaida-linked Al-Nusra Front, which officials here fear seeks to hijack the revolution, as a terrorist group.