Four of the suicide bombers struck yesterday in the Al- Nur camp near the border town of Arsal, the army said. A young girl, whose parents are both refugees, was killed and three soldiers wounded.
A medical source in the provincial capital Baalbek said the girl was two and a half years old.
Troops recovered four explosive devices.
During a raid on Al-Qariya, another camp near Arsal, one militant blew himself up and a second threw a grenade at troops, wounding four of them.
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The raids were aimed at "arresting terrorists and seizing weapons," the army command said.
A military source told AFP that troops made a number of arrests.
"The objective of the operation was to arrest a wanted man and it was this man who was the first to blow himself up," the source said.
A leading Syrian opposition body late Friday accused the Lebanese army of violating refugee rights.
"The National Coalition strongly condemns the systematic attacks today against refugee camps in Arsal... During which (refugees) were humiliated and treated like hostages," a statement said.
There have been multiple clashes along the border between the Lebanese army and jihadists of the Islamic State group or Al-Qaeda.
In August 2014, the army clashed with jihadists of IS and Al-Qaeda's then Syria affiliate Al-Nusra Front in the Arsal region, with militants kidnapping 30 Lebanese soldiers and policemen as they withdrew back along the border.
After long and arduous negotiations, 16 of the kidnapped men were released in December 2015 in exchange for Islamist prisoners held in Lebanese jails.
Since 2014, both the Lebanese army and Shiite militant group Hezbollah have carried out attacks on Syria-based jihadists in eastern Lebanon.
Hezbollah has intervened in the war in Syria in support of President Bashar al-Assad, sending tens of thousands of fighters.
Its strongholds in Lebanon have been hit by several deadly attacks claimed by IS.
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