Abu Qatada, described as al-Qa'eda's spiritual ambassador in Europe, is believed to be among the ten held today. Qatada, 44, a Jordanian father of five who has lived in the UK for 12 years, is currently the subject of a control order at his London home. Control orders were imposed after the Government's policy of detaining foreign terror suspects without charge was ruled unlawful by the Law Lords. Some of the other people detained today were also subject to control orders, sources said.Today's detentions follow the signing of a memorandum of understanding with Jordan yesterday ensuring deportees would not be mistreated on their return. Prime Minister Tony Blair also had "constructive conversations" with authorities in Algeria and Lebanon last week over guaranteeing the safety of deportees. In all, Britain is looking for assurances from 10 countries, a Home Office spokeswoman said. The police forces involved in today's detentions were the Metropolitan Police, Bedfordshire, Leicestershire and the West Midlands, the Home Office said.