Zagreb-based Večernji List says that 12 Serbians, 9 Croatians, 11 Ukrainians and 10 Colombians were among those captured, and then shot and killed by the rebels, while other victims "were not identified".
The newspaper is quoting the rebels in Misrata who claim that "a group of foreign mercenaries" was inside "the security building" in the town's center - and that those who did not die in the fighting were "convicted on the spot".
"A bullet to the head and goodbye forever," a local rebel commander was quoted as saying, and then adding: "Those are murderers, not soldiers, they are people who are heartlessly killing for money."
In Belgrade, the Ministry of Foreign Affairs said they had no information about Serbian citizens being executed.
"We saw this in the newspapers and we are checking it. As for the five Serbian citizens detained in Zintan, we are in contact with them and they are doing well, while we're doing all we can to set them free," an official of the ministry was quoted as saying.