Libyan Prime Minister Ali Zeidan has been kidnapped by militants from his residence in the capital Tripoli, a well-placed source in his media office has told the BBC.
Mr Zeidan has been taken to an unknown destination for unknown reasons by a group of men believed to be former rebels, the government website said.
On Tuesday Mr Zeidan called on the West to help stop militancy in Libya.
In an interview with the BBC he said it was being used as a weapons base.
The prime minister told the Newsnight programme that his country was being used to export weapons throughout the region.
Two years after the revolt which overthrew Muammar Gaddafi, Libya’s government has been struggling to contain rival tribal militias and Islamist militants who control parts of the country.