Israeli soldiers fired at a Lebanese army post in the Shebaa Farms area near the border Sunday, wounding one soldier, the Army announced in a statement.
The wounded soldier, identified as Zakaria Hamza al-Masri by a security source, was shot in the hand, the sources said, prompting troops to return fire.
In a statement posted to Twitter, the Israeli military claimed it shot at two people it discovered "infiltrating Israeli territory from Lebanon."
"The suspects escape north, returning to Lebanon," it added.
The army is coordinating with the United Nations Interim Forces in Lebanon to investigate the incident, the statement said, after taking defensive measures.
Israeli troops routinely violate the internationally recognized Blue Line around the As-Sendaneh area to kidnap shepherds and conduct other opertations.