Russia on Friday seized a consignment of the radioactive isotope Sodium-22 at a Moscow airport from a passenger who was to travel on a flight to Tehran, the customs service said.

"Tests showed that the Sodium-22 could only have been obtained as the result of the work of a nuclear reactor," it said in a statement. "A criminal enquiry has been opened and the materials transferred to prosecutors."

Hundreds of thousands of Syrians protested nine months into their uprising on Friday, demanding the Arab League hasten its response to a bloody crackdown on dissent, as activists said security forces shot dead 17 people across the country.

Nine people were killed in the central province of Homs, three in the central province of Hama, three in the southern province of Daraa and two near the capital Damascus, the Local Coordination Committees reported.

Syrian military commanders have ordered troops to indiscriminately shoot at unarmed protesters, Human Rights Watch said in a report released Thursday based on interviews with former soldiers who defected.

The defectors named 74 military and intelligence officers "who allegedly ordered, authorized, or condoned widespread killings, torture, and unlawful arrests," the rights group said in a statement.

U.N. leader Ban Ki-moon said Wednesday that the international community must now act against the Syrian government's crackdown on protests "in the name of humanity."

Ban told a press conference he has sent a U.N. Human Rights Council report on the Syrian regime's crackdown to the U.N. Security Council. This could increase pressure on the 15-nation council to act even though Russia and China vetoed a resolution on the crisis in October.

Army defectors killed at least eight Syrian troops Wednesday in an act of revenge after security forces shot dead five civilians, activists said, in the second such insurgent attack in as many days, as the Local Coordination Committees said regime troops killed 26 civilians on Wednesday.

The LCC, the main activist group spurring protests on the ground, said security forces shot dead nine people in Homs, eight in Hama, three in Idlib, two in Damascus, two in Daraa, one in al-Qamishli and one in the Damascus suburb of al-Zabadani.

Syrian security forces shot dead at least one person early Monday as they launched a raid in the northwestern province of Idlib, where mutinous soldiers were fighting army troops, a rights group said.

The violence came as pro-democracy activists pushed a campaign of civil disobedience launched Sunday with a general strike across Syria designed to bring down the regime of President Bashar Assad.

United Nations chief Ban Ki-moon will discuss with senior Lebanese officials during his upcoming visit to Beirut the cooperation protocol of the Special Tribunal for Lebanon that is opposed by the majority of the cabinet members.

The protocol expires in March.

The Registrar of the Special Tribunal for Lebanon Herman von Hebel stated on Wednesday that predicting the judicial process in the tribunal is “very difficult.”

He expected however that the trial in the case of the assassination of former Premier Rafik Hariri may begin in 2012.

A delegation from the Special Tribunal for Lebanon Prosecutor Daniel Bellemare’s office will visit Beirut soon to meet with General Prosecutor Saeed Mirza, Justice Minister Shakib Qortbawi and Interior Minister Marwan Charbel, al-Liwaa newspaper reported on Tuesday.

The daily reported that the delegation is expected to inquire the Lebanese officials about the exerted efforts to detain four Hizbullah suspects indicted in ex-PM Rafik Hariri’s murder, and the difficulties hindering the implementation of the international arrest warrants.

U.S. Assistant Secretary of State for Near Eastern Affairs Jeffrey Feltman, who will arrive in Beirut on a two-day visit on Wednesday, is expected to hold talks with senior Lebanese officials over matters concerning the security and political situation in the country.

“Feltman will focus (in his talks) on the security and political situation in Lebanon and the regional situation especially in Syria,” a U.S. diplomatic source told As Safir newspaper on Tuesday.