Journalists are planning to demonstrate outside the Libyan embassy in London on Thursday to demand the release of the Al-Jazeera crew who are being held in Tripoli.

Staff from Al-Jazeera will be joined by members of the National Union of Journalists outside the embassy in Knightsbridge (near Hyde Park Corner).

It was last month when the network's reporter Ahmad val ould Eddin was detained along with cameramen Ammar Al-Hamdan and Kamel Al Tallou. But Gaddafi's authorities have not explained why they are being held.

There are profiles of the men on the Al-Jazeera website. The demonstration will start at noon and run until 4pm.

NUJ general secretary Jeremy Dear said: "We are demonstrating in support of our Al-Jazeera colleagues because it is vital to their safety that attention is focused on their plight at a time when the enormity of events in Libya might cause them to be forgotten."

Sources: NUJ/Al-Jazeera