"The Germans abducted last night in the eastern Bekaa Valley were released today," NNA said.
"After they were freed, a police unit from the Internal Security Force arrested the Germans on charges of drug trafficking, and a search for the abductors is underway," it reported.
The Germans were seized yesterday by unknown gunmen demanding a ransom for their release, in what a security official said appeared to be a criminal rather than a political act.
The Bekaa Valley, which borders on war-hit Syria, is a lawless but fertile region where drug cultivation and trafficking has flourished for years.
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During the 1975-1990 civil war, the drug trade grew into a multi-billion dollar industry in Lebanon.
The Lebanese authorities have struggled to eradicate the drug trade and carry out repeated army and police patrols in the region to impose the law, but farmers who mostly cultivate hashish constantly defy them.