Syrian rebels on Friday seized an air defence base near the northern city of Aleppo, with footage posted online showing them in control of large missiles mounted on military trucks, dpa reported.
Rebels and government forces have for months been fighting for control of Aleppo, Syria's largest city and main commercial centre. The al-Ta'ana air base lies east of Aleppo.
The seizing of the base comes at a time of rising tension tensions between Syria and Turkey, which on Friday put its army on alert and sent reinforcements to the border after a Syrian helicopter shelled rebel positions near the frontier.
Turkish media, cited government sources as saying that Turkey would transfer 15 fighter jets to the southeastern city of Diyarbakir, some 120 kilometres from the Syrian border.
The Dubai-based television Al-Arabiya reported that two Turkish jets took off on a reconnaissance mission from a military base in Diyarbakir after the incident.
An additional 60 tanks are also being moved to the region, bringing their total to 250, the Turkish daily Hurriyety reported.
The reinforcements on the Turkish side was the latest sign of rising tension between the two neighbours after shells fired from Syria last week killed five Turkish civilians.
Tensions have been also rising after Turkey said it had found Russian-made military equipment on a Syrian civilian plane that it forced to land in Ankara.
Russian Foreign Minister Sergei Lavrov said the plane was lagally carrying radar parts.
Syria has denied the plane was carrying military equipment had challenged Turkey to put the cargo on public display.
Turkish jets on Thursday forced the passenger plane flying from Moscwo to Damascus to land in Ankara, where it was searched.
Syrian state television said Damascus had sent a statement to the United Nations Security Council, urging it to stop what it called "Turkish provocations."
After last week's deadly shelling attack, the Turkish parliament voted to allow the army to carry out operations inside Syria. The Turkish military has responded to Syrian shelling attacks by firing back.
In Syria, activists reported clashes in the northern area of Idlib, where they are trying to hold on to posts seized from government forces.
There were also battles in Aleppo, Syria's largest city and main commercial centre.
At least 110 people were killed across Syria on Friday, mainly in Aleppo and Idlib, said opposition activists.
"The government troops have suffered heavy casualties in the area in the past 24 hours. Our records show that more than 50 regime soldiers have been killed in Idlib alone," Rami Abdul-Rahman, the head of the Syrian Observatory, told dpa.
Despite the violence, mass protests were held Friday in several areas of Syria, calling for an end to the regime of President Bashar al-Assad, said activists.
Security forces fired on demonstrators in the district of Halab al-Jadida in Aleppo, wounding an unspecified number of protesters, they added.
News from Syria cannot be independently verified, as authorities have barred most foreign media from the restive areas since the uprising against al-Assad's regime started in March last year.
In neighbouring Lebanon, 10 missiles fired by Syrian warplanes hit the outskirts of the eastern Bekaa village of Tufail, causing no casualties, local media reported.