Monrovia - Mystery on Tuesday surrounded the swarm of caterpillars in Liberia which have devastated crops and prompted an official state of emergency, after officials admitted they could not identify them.
"They are not army worms, though we haven't determined what they are," Agriculture Minister Chris Toe told a news conference in the West African state's capital on Monday.
The head of the team set up by the government to investigate and contain spread of the pests, Dr J Qwelibo Subah, confirmed they are yet to identify the species.