(CNN) -- Syrian rebels across the country are moving toward a unified command, the latest step in a consolidation by the opposition as it seeks to garner stronger international support.
Under a preliminary agreement reached Friday by the disparate Free Syrian Army units, each Syrian province will have a civilian rebel council leader and a military council leader.
The commanders will be under the leadership of a newly named chief of staff, Gen. Salim Idris, Free Syrian Army spokesman Louay Almokdad said. In all, the council would have 30 members, including the chief of staff and a deputy chief of staff.
All members of the new leadership team are Syrian and mostly are from inside Syria, he said.
It is premature to call the new group the Supreme Military Council, but the agreement is a step toward forming the higher military council, Almokdad said.
The united military front follows the creation of the National Coalition for Syrian Revolutionary and Opposition Forces, a new coalition of groups opposed to the leadership of President Bashar al-Assad.
The United States, in particular, had been pushing for the opposition to unite.
The American calls for unity came amid concerns about the increasing radicalization of some armed factions of the opposition. The stronger the radical groups become, the more the United States worries that the fighting -- not political efforts to find a solution -- will decide the outcome in Syria.
Efforts are under way for the United States to formally recognize the newly formed Syrian political opposition coalition as the legitimate representative of the Syrian people, which France and Britain have already done.
Early next week, Secretary of State Hillary Clinton will travel to Marrakesh, Morocco, for a meeting of the Friends of the Syrian People, a gathering of countries that support the political transition.
The Obama administration, while providing non-lethal assistance, is expected to take the first steps toward officially recognizing the National Coalition at that meeting.
The Free Syrian Army hopes for the same support now that it attempts to unify.
A new defense minister for the Syrian opposition coalition is expected to be named later this month, Almokdad said.
On Saturday, at least 129 people were killed throughout the country, including 16 children, the opposition Local Coordination Committees reported. Fifty-eight people were killed in the Damascus suburbs. Thirteen died in Daraa province, 20 in Idlib, 18 in Aleppo, 15 in Dier Ezzor, two in Hama, two in Homs and one in Raqqa, the group said.
Shelling occurred at 232 locations, according to the LCC, and rebels clashed with the Syrian army in 120 locations with the highest concentration in and around Damascus.
Syria's government maintains control of Damascus, while the rebels have taken large parts of northern Syria, including parts of the most populous city, Aleppo.
Concern about chemical weapons
Britain's foreign secretary on Saturday cited evidence that the Syrian regime could use its stockpile of chemical weapons against rebels battling government forces.
William Hague said that there was no simple "red line" which could trigger international military action, but that Britain and its allies had "contingency plans concerning chemical weapons" which he declined to disclose.
Recent U.S. intelligence suggests the Syrian government has started mixing chemical weapons compounds and loading them into bombs, though the bombs are not being moved to any delivery devices, CNN's Barbara Starr reported.
The concern is not only that the Syrian regime may use chemical weapons, but that they could fall into the hands of terrorist groups.
The Syrian foreign ministry on Saturday reiterated its position that it will not use chemical weapons, if it possesses any, under any circumstances, the state news agency SANA reported.
In two letters addressed to the U.N. Security Council and the U.S. Secretary-General, the ministry warned that "terrorist groups might resort to using chemical weapons against the Syrian people... after the terrorist groups recently took hold of a chlorine processing plant to the east of Aleppo city," according to SANA.
The Syrian government commonly refers to anti-government rebels as "terrorists."
"Syria is defending its people against terrorism supported by known countries, above all (the) USA," the ministry wrote.
The Free Syrian Army rejected any claim that it could have or use chemical weapons. "We do not plan, own, or have the capability to use chemical weapons against our own people," said political and media coordinator Louay Almokdad.
Another view on weapons
Fears of chemical weapons use by the Syrian government are "hysterical hype," former U.S. National Security Adviser Zbigniew Brzezinski said Saturday.
Speaking with CNN's Randi Kaye, Brzezinski said it does not make sense that the Syrian regime would employ such weapons when doing so would in effect poison its own people.
The fighting in Syria is not along traditional fronts, but sporadic outbreaks of fighting, making chemical weapons not very effective, he said.
"It's more like a guerrilla warfare. How do you use chemical weapons against that," he said.
The real challenge, Brzezinski said, is creating a stable situation in Syria so the conflict does not spill into Jordan, Lebanon or Iraq.
CNN's Elise Labott contributed to this report.