British cameraman held in Tripoli
A British journalist is being held by Libyan authorities in Tripoli, Al Jazeera Network has confirmed.
Kamel Atalua, a cameraman, was captured with fellow cameraman Ammar al-Hamdan and correspondents Lotfi al-Messaoudi and Ahmed Vall Ould Addin.
The Al Jazeera team have been reporting from Libya for several days, an official Al Jazeera source said, adding that the Libyan authorities would be held responsible for the team's safety and that efforts were being made to secure their release.
Mr al-Messaoudi is of Tunisian nationality, Mr Addin is Mauritanian and Mr al-Hamdan is a Norwegian citizen.
There have been several journalists captured by Libyan authorities during the unrest.
On Wednesday Guardian journalist, Ghaith Abdul-Ahad, was released from captivity after having been missing for two weeks. The Iraqi national had been picked up in the coastal town of Sabratha, in the northwest of the country and was detained by the Libyan authorities.
Mr Abdul-Ahad was held with Brazilian journalist Andrei Netto who was then released a week before the Guardian reporter.
Prior to this, a BBC news team were detained and repeatedly beaten by the Libyan security forces after being accused of spying.
Three members of the corporation's Arabic staff were held for 21 hours in various military compounds where they were hooded, handcuffed, assaulted and subjected to a mock execution.
The Foreign Office said it was investigating reports of Mr Atalua's detention.