The rebel Free Syrian Army (FSA) has announced that it has moved its command centre from Turkey to "liberated areas" inside Syria.
A video posted on YouTube appeared to show the leader of the FSA, Riad al-Asaad, confirming the move.
It is not clear exactly when the move took place, or where in Syria the FSA's new headquarters are.
The FSA is the most prominent of the armed groups fighting to overthrow the regime of President Bashar al-Assad.
In the video, Gen Asaad says the FSA will fight "side by side" with "all brigades and factions" until victory.
The move was made the previous week and "aimed to unite all rebel groups", Brig Gen Mustafa al-Sheikh of the FSA's military council told the Associated Press news agency.
The FSA has previously been criticised in the past for leading from Turkey and having little control over locally-based rebel fighter networks.