LONDON (AFP) - Three men were arrested Saturday on suspicion of conspiracy to murder the British soldier who was hacked to death in a London street by two Islamists.

Two men aged 24 and 28 were arrested at a residential address in southeast London while a 21-year-old man was arrested in the street around 1.5km from the murder scene, Scotland Yard police headquarters said in a statement.

Taser electric stun guns were used on the 28-year-old and the 21-year-old, though neither needed hospital treatment.

Drummer Lee Rigby, 25, who survived a tour of duty in Afghanistan, was butchered in broad daylight Wednesday outside the Royal Artillery Barracks in Woolwich, southeast London.

The three men were all arrested between 6pm and 6.30pm by detectives from the Counter Terrorism Command supported by specialist firearms officers.

All three were being taken to a south London police station, the police statement said.

Officers were also searching four residential addresses in south-east London.

Meanwhile a 29-year-old man arrested on Thursday on suspicion of conspiracy to murder has been bailed to return to a police station pending further enquiries.

Michael Adebolajo, 28, and 22-year-old Michael Adebowale remain in a stable condition after being shot by police at the scene of the grisly killing.

They have both been arrested on suspicion of murder and are under armed guard in separate hospitals.