Murdered soldier Lee Rigby has been formally identified but the cause of his death was not confirmed by a post-mortem examination, police said.
Drummer Rigby, 25, was hacked to death in the street in a horrifying attack in Woolwich, south-east London on Wednesday.
A post-mortem examination was carried out on his body on Thursday but no cause of death has been confirmed, Scotland Yard said. An inquest into his death will be opened in due course.
Detectives are questioning a man and a woman, both 29, who were arrested on Thursday on suspicion of conspiracy to murder Drummer Rigby.
Scotland Yard has not revealed whether officers have been able to speak to the two men who were shot by police in the wake of the murder. They remain in hospital in a stable condition with non-life threatening injuries, having been arrested on suspicion of murder on Wednesday.
Dramatic footage has emerged of the two men apparently charging at armed police in the wake of the killing - one clutching bloodied weapons including a meat cleaver and the other a gun - and then being shot. Other chilling film clips show one of the men with heavily bloodstained hands claiming he had carried out the killing in the name of Allah.
In moving tributes, father-of-one Drummer Rigby was described by his family as "a loving son, husband, father, brother and uncle".
In a statement his family said: "Lee was lovely. He would do anything for anybody, he always looked after his sisters and always protected them. He took a 'big brother' role with everyone. All he wanted to do from when he was a little boy was be in the Army. He wanted to live life and enjoy himself. His family meant everything to him. He was a loving son, husband, father, brother, and uncle, and a friend to many. We ask that our privacy be respected at this difficult time."
Six residential addresses were searched on Thursday as part of the investigation, three in south London, one in east London, one in north London and one in Saxilby, Lincolnshire, the former home of a man called Michael Adebolajo.The second attacker has been named in reports as Michael Oluwatobi Adebowale, of Greenwich, south-east London.
US president Barack Obama added his voice to those condemning the murder. He said: "I condemn in the strongest terms the appalling attack against a British service member in Woolwich on May 22. The United States stands resolute with the United Kingdom, our ally and friend, against violent extremism and terror. There can be absolutely no justification for such acts, and our thoughts and prayers are with the family of the victim, the police and security services responding to this horrific act and the communities they serve, and the British people."