The area where the soldiers were killed was near a border stronghold close to the mountains of Arsal, where Hezbollah militia recently forced militants to leave in a joint cross-border operation with the Syrian army, the source added.
The Lebanese army had launched an offensive on Saturday against an ISIS enclave on the northeastern border with Syria.
The Lebanese Hezbollah also announced an assault on the militants from the Syrian side of the frontier.
An army spokesman said on Saturday that a third of the area in the hands of the militants had been recaptured since the offensive began, with 20 militants killed in direct combat, shelling or aerial strikes, while 10 soldiers had been injured.
Northeastern Lebanon was the scene of one of the worst spillovers of Syria's war into Lebanon in 2014, when ISIS and Nusra Front terrorists attacked the town of Arsal.
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20 August 2017 - 16:27
News ID: 849492
(AhlulBayt News Agency) - Three Lebanese soldiers were killed and one was critically wounded on Sunday when their armored vehicle hit a landmine on the Lebanese-Syrian border, a security source said.
