Kidnappers seized Egypt's cultural attache and three other embassy staff in Tripoli Saturday a day after another of its diplomats was abducted, the Libyan foreign ministry said.
"The cultural attache and three other staff were kidnapped in Tripoli," ministry spokesman Said Lassoued told AFP.
The early morning abduction came a day after the seizure of an embassy administrative adviser from his home in the capital and despite Libya's announcement of "reinforced security measures" around the Egyptian embassy.
A security official would not rule out that the earlier kidnapping was a response to the arrest in Egypt on Friday of a prominent former rebel commander who fought in the 2011 uprising against Moamer Kadhafi.
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Shaaban Hadeia, head of the Operations Centre of Libya's Thuwar (revolutionaries), unofficially linked to Libya's defence ministry, was arrested on Friday in the city of Alexandria on Egypt's Mediterranean coast, the source added.
The presidency of the General National Congress, Libya's highest political authority, ordered the ambassador in Cairo to demand an explanation of Hadeia's arrest and seek his immediate release.
Libya has been struggling to integrate the rebel groups that helped topple the Kadhafi regime into the regular armed forces. Militias have carved out their own fiefdoms, each with its own ideology and regional allegiances.
There has been a spate of attacks on foreign missions as well as Libyan security personnel, some blamed on groups inspired by Al-Qaeda.
Prime Minister Ali Zeidan was himself briefly abducted by former rebel militia last October.