LONDON (Reuters) - A worker with British-based rights group Amnesty International and a colleague from Human Rights Watch have been detained in Cairo and taken to an unknown location, Amnesty said on Thursday. We call for the immediate and safe release of our colleagues and others with them who should be able to monitor the human rights situation in Egypt at this crucial time without fear of harassment or detention, said Salil Shetty, Secretary General of Amnesty International. Amnesty said its representative was detained after police took over the Hisham Mubarak Law Centre in the city. A number of other activists were still being held in the Centre, Amnesty said. In a separate incident, the BBC said a camera and a laptop had been confiscated from two of its team covering the protests in Cairo. We are working with the FCO (Foreign Office) and the Egyptian authorities to have them returned, a BBC spokesman said.