Three men who were held on suspicion of conspiracy to commit murder in connection with last week's Woolwich murder have been released on bail.
The group, aged 21, 24 and 28, were arrested in south-east London on Saturday, three days after Drummer Lee Rigby, 25, was hacked to death in Woolwich.
They have been bailed to return to a south London police station, according to the Metropolitan Police.
Michael Adebolajo, 28, and 22-year-old Michael Adebowale, who were arrested on suspicion of murder at the scene of the killing on Wednesday, remain under arrest in hospital, and will be formally interviewed when their physical condition improves.
Counter-terrorism officers continue to question a 22-year-old man who was arrested on suspicion of conspiracy to murder in Highbury Grove, north London.
Deputy Assistant Commissioner Stuart Osborne said: "This remains an ongoing investigation, focused upon public safety and identifying any others that may be involved.
"The investigation is progressing well, but there is still a lot more work to be done."
Anti-terror police in Nairobi confirmed last week that Adebolajo was also arrested in Kenya in 2010 under suspicion of being at the centre of an al-Qa'ida-inspired plot.
Meanwhile, two people have been arrested on suspicion of arson after a fire was discovered shortly before 10pm yesterday at the Grimsby Islamic Cultural Centre.