The two victims were "taken to an unknown location" after their kidnappers tried in vain to coerce a cash transfer bureau to hand over money in one of the abductees' names, said the NNA yesterday.
"The kidnappers later made a call to one of their friends, demanding ransom," the agency added.
Speaking to AFP on condition of anonymity, a security official said the police received information of the kidnapping late yesterday.
"We are following up on the case. It appears to be a non-political kidnapping for financial reasons," he said.
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"Later, a Lebanese man called demanding a ransom of 6,000 euros (USD 8,000)," he added.
Another police source told AFP the two kidnapping victims were dual nationals, holding both German and Lebanese citizenship.
The kidnapping is the first of its kind since 2011, when a group of seven Estonian cyclists were abducted for four months.