Police investigating the death of soldier Lee Rigby in Woolwich arrest a 50-year-old man.
The suspect was arrested in Upper Wickham Lane, Welling, south east London, Scotland Yard said. An address is also being searched in south east London.
The arrest is the tenth officers have made after the murder of Drummer Lee Rigby, 25, who was killed last week.
Earlier on Monday three men, aged 21, 24 and 28, were released on bail after being arrested on suspicion of conspiracy to commit murder.
Two men arrested on suspicion of Drummer Lee Rigby’s murder, Michael Adebolajo and Michael Adebowele, remain in custody in hospital after being shot by police at the scene of Wednesday’s attack. They are not expected to be questioned until at least Tuesday.
It emerged on Saturday that Adebolajo was arrested in Kenya three years ago over fears he was attempting to join an al Qaida-linked militant group.
Counter-terrorism officers are also continuing to question a 22-year-old man in north London, who was arrested on Sunday on suspicion of conspiracy to murder.
In a separate development, police in London are investigating after two monuments – the Animals in War memorial in Park Lane and the RAF Bomber Command memorial in Green Park – were defaced with the word Islam in red spray paint.
Read more: Woolwich suspect has been 'preaching for years'
After it emerged that Adebolajo was known to MI5 for years before the attack, Home Secretary Theresa May has given a strong indication that she is ready to revive plans for a so-called “snoopers’ charter“. She says the communications data bill will help security services tackle terrorism.
In a move that will infuriate many Liberal Democrats, Mrs May said it was “essential” that police and intelligence agencies had access to information such as emails and internet data to help counter extremism.
She hinted that tighter rules could be imposed on internet service providers, and suggested that a lower limit for imposing banning orders of extremist groups could be introduced.
Extremist preachers could also be banned from television under new powers for Ofcom, the broadcasting watchdog, it was reported.