Turkey has returned fire after Syrian mortar bombs landed in a field in southern Turkey, a day after Prime Minister Tayyip Erdogan warned Damascus that Turkey would not shy away from war if provoked.
Turkish forces have fired across the frontier into Syria after a shell launched from Syria landed in Turkey's border town of Akcakale, underlining Ankara's warning that it will respond with force to any violence spilling over into its territory.
Turkey has stepped up retaliatory artillery strikes on a Syrian border town, killing several Syrian soldiers, while its parliament approved further military action in the event of another spillover of the Syrian conflict.
Turkish Prime Minister Tayyip Erdogan says a Syrian passenger plane forced to land in Ankara was carrying Russian-made munitions destined for Syria's armed forces, ratcheting up tension with his country's war-torn neighbour.
Turkey has banned all Syrian aircraft from its air space as it takes an increasingly firm stance against President Bashar al-Assad, while Syrian rebels said they had made more gains in a key province near the Turkish border.
Syrian jets have bombed parts of Damascus in what residents said were the capital's fiercest air raids yet, at the end of what was supposed to be a four-day truce.
An Islamist suicide car bomber has killed at least 50 Syrian security men in Hama province, an opposition group said, in what would be one of the bloodiest single attacks on President Bashar al-Assad's forces in the 20-month-old uprising.
Anti-government rebels have killed 28 soldiers in attacks on three army checkpoints around Saraqeb, a town on Syria's main north-south highway, a monitoring group said.
A powerful car bomb exploded in Damascus and forces loyal to Bashar al-Assad clashed with rebels across Syria as a truce intended to mark a Muslim religious holiday unravelled and activists reported at least 70 deaths.
The international mediator on Syria says its civil war risks spilling across borders to engulf the Middle East and appealed for a temporary truce he said could mark a small step towards defusing 19 months of conflict.
Russia says no weapons were aboard a Syrian civilian jet grounded by Turkish authorities on Wednesday and the plane had been carrying a legal shipment of radar equipment.
Rebels are battling to hold on to Syria's main north-south highway as government forces fight insurgents on several fronts across the country.
A large bomb has exploded in an area housing security and army compounds west of Umayyad Square in central Damascus, opposition activists say.
Turkish President Abdullah Gul says the "worst-case scenarios" are now playing out in Syria and Turkey will do everything necessary to protect itself, as its army fired back for a sixth day after a shell from Syria flew over the border.
Arthur Chesterfield-Evans questions the Western media portrayal of the Syrian reality.
The UN Security Council has condemned a Syrian mortar attack on a Turkish border town that killed five people and demanded that "such violations of international law stop immediately and are not repeated."
Turkey's military has struck targets inside Syria in response to a mortar bomb fired from Syrian territory which killed five Turkish civilians, Prime Minister Tayyip Erdogan's office said in a statement.
A Syrian rebel bomb attack has reduced the army headquarters in Damascus to a smouldering wreck as world leaders, unable to break the diplomatic deadlock in the conflict, met at the United Nations.
The international mediator on Syria says he has "a few ideas" but not a full plan on how to end the country's 18-month conflict, which he described as "extremely bad and getting worse."
Syrian rebels seized another border crossing with Turkey on Wednesday, consolidating their grip on a frontier through which they ferry arms for battles with President Bashar al-Assad's troops around the northern city of Aleppo.