ANTAKYA, Turkey/BEIRUT (Reuters) - A military bombardment of a town in central Syria killed 35 people on Monday on the eve of a scheduled army withdrawal from urban areas, opposition activists said, dashing the prospects of a U.N.-brokered ceasefire taking hold.

Troops and rebel forces also clashed near the border with Turkey, activists said. Two Syrian refugees and a Turkish translator were wounded by gunfire from Syria at a refugee camp inside Turkey territory, Turkish officials said, drawing an angry response from the Ankara government.

Bloodshed also spilled into northern Lebanon, where a cameraman for Al-Jadeed television channel was shot dead in the border region between Syria and Lebanon's Wadi Khaled district, sources at the channel said.

United Nations Secretary-General Ban Ki-moon said he "deplored" the cross-border shootings.

The unrelenting violence indicated that a peace plan promoted by international envoy Kofi Annan and initially accepted by both sides was in tatters.

Syria was to have started pulling troops out of towns and cities by Tuesday, paving the way for a ceasefire to start 48 hours later.

But President Bashar al-Assad on Sunday said his foes must give written guarantees they would stop fighting and lay down their arms - a demand they immediately rejected.

Nor did government forces show any sign they were starting to pull back on Monday.

"April 10 has become void," Turkish Deputy Foreign Minister Naci Koru said in Ankara, referring to the deadline.

Washington said Syria's demand for written guarantees was a "stall for time" and European Union foreign policy chief Catherine Ashton said in Brussels that adding new conditions was totally unacceptable.

China, which has supported Assad in his year-long effort to crush the uprising against his family's dynastic rule, called on both sides to honor the ceasefire and support Annan's efforts.