The Sabratha Media Center, a local activist group, said the other was from New Zealand, CNN reported. New Zealand officials said they were trying to confirm that.
The names of the dead, a man and woman, had not been released Friday. A photograph posted on the media center website suggested they were having a picnic on the beach in a remote area outside the city of Sabratha when they were killed.
"At the time we record our extreme regret and disturbance over the killing of the two victims -- one British and the other a New Zealander -- and while we wait for the results of the investigation that aims to find the perpetrator, the Sabratha Local Council and the residents of the area offer their deepest condolences to the families of the deceased and to the states of Britain and New Zealand as this act is contrary to our morals and values of our religion," the media center said in a statement.