Two Israeli soldiers were lightly injured by cross-border fire on the Israeli-occupied Golan Heights facing Syria on Wednesday, Israeli security sources said.
They said Israel returned fire but did not give details, and the army spokesman's office had no immediate comment.
Israeli news website Ynet said only one soldier was physically hurt, by shrapnel from mortar fire, while the other soldier was suffering from shock.
The security sources said it was not immediately clear if the men came under mortar or small-arms fire.
The Golan, seized by Israel from its Arab neighbour in the 1967 Six-Day War, has been tense since the 2011 start of the conflict in Syria between rebels and regime forces.
On 12 September, three apparently stray mortar shells landed in the Israeli-held sector without causing casualties. Israel returned fire after shells landed in territory under its control in August.