UK police quiz Litvinenko friend
525965
British police question a Russian dissident over his meeting with murdered ex-Russian spy Alexander Litvinenko.
174846
British scientists probing the death of  Alexander Litvinenko are carrying out tests on Saturday on one  of his contacts who has been contaminated with the same  radioactive poison that killed the former Russian spy.
165106
British investigators visiting Moscow to probe the death of Russian former intelligence agent Alexander Litvinenko are to meet key witness Andrei Lugovoi, Lugovoi said, as newspapers predicted the mystery would not be resolved quickly.
206259
Police step up inquiries into the death of Russian ex-spy Alexander Litvinenko, with officers due to fly to Moscow.
533105
British police investigating the poisoning of Alexander Litvinenko will go to Moscow to speak to witnesses who met the former Russian spy in London shortly before his death, a police source said.
49236
A watchdog is to quiz defence officials after a laptop with personal details of 600,000 people is stolen.
151765
Russian authorities charge a man with spying for Britain - the latest step in an espionage row between the two countries.
744040
British investigators in Moscow probing the poisoning death of Alexander Litvinenko met a witness in the case amid signs of discord with Russian prosecutors in the inquiry.
398055
At least one of two businessmen who met Alexander V. Litvinenko on the day he became ill was questioned.
593721
British detectives were in Moscow to continue their investigation into the mysterious poisoning death of former spy Alexander Litvinenko, as diplomatic tensions between Britain and Russia rose closer to the surface.
552304
A former Russian secret service agent claimed that he was recruited by British intelligence through Alexander Litvinenko, the agent murdered last year, in a Russian television interview aired on Friday.
272889
British police have been granted another week to quiz five people still in custody, who have not yet been charged, in connection with an investigation into the foiled alleged terror plot to blow up US-bound jets, a police spokesman told AFP.
572978
Alexander Litvinenko, the former Russian  agent murdered in London last year, was working for British  intelligence, the man charged by Britain with his murder  alleged on Thursday.
300270
Police say traces of radiation have been found in a Hamburg flat used by a contact of Alexander Litvinenko.
215437
Russian police seek Home Office  permission to visit the UK as part of their inquiry into Alexander Litvinenko's death.
86499
A contact of ex-KGB spy Alexander Litvinenko is to meet UK investigators, an associate has told the BBC.
258373
Officers investigating the death of ex-spy Alexander Litvinenko pursue inquiries in London and Moscow.