The United Nations has adopted a resolution supporting efforts by Russia and Turkey to end violence in Syria and start peace negotiations.
Russia and Turkey announced the ceasefire this week, the third truce this year seeking to end the nearly six years of war in Syria.
Peace talks between President Bashar al-Assad's government and rebel forces in Syria are set to take place next year in Kazakhstan.
Clashes between rebels and Syrian government forces have been reported within two hours of a nationwide ceasefire taking effect.
The British-based Syrian Observatory for Human Rights monitoring group said rebels violated the deal backed by Russia and Turkey and had taken over a position in Hama province.
A spokesman for the Jaish al-Nasr rebel group accused government forces of violating the truce by shelling areas in two villages in Idlib province, which borders Hama.
Gunfire was earlier reported in the southern Syrian provinces of Deraa and Quneitra.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.