This story contains video that some viewers may find graphic.
(CBS News) LONDON - Friends and family of British soldier Lee Rigby paid their first visits on Sunday to the scene where he was brutally killed in broad daylight.
Clutching a teddy bear and unable to fight back tears, Lyn Rigby needed help to keep her from collapsing at the scene of her son's murder.
Lee Rigby's family laid flowers where thousands more had done so before them.
His widow and mother of their two-year-old son tied a balloon with the words 'Dad in a million.'
Kenyan officials confirmed Sunday one of Rigby's killers, Michael Adeboloja, on the Somali border on suspicions of preparing to fight with al Shabab an al Qaeda linked group in Somalia.
He accused Kenyan police of abuse.
"They're mistreating us, believe me," he said in court.
He was soon deported back to Britain.
On Wednesday, a bloodied Adebolajo is seen ranting moments after allegedly hacking British soldier Lee Rigby to death.
Investigators said they haven't been able to question him yet. He's recovering from gunshot wounds after a confrontation with police shortly after the murder.
Police continue hunting down others who might be linked to the killing.
One more man was arrested Sunday in addition to three last night.
Home Secretary Theresa May told the BBC "all the indications" point toward a lone wolf attack rather than a planned operation, but investigators are searching every lead.
"We now have around 500 officers and others who are working on the case, including some officers who have been brought through from counter-terrorism units elsewhere in the country," May said on BBC's "Andrew Marr Show."
In the wake of the killing, British Prime Minister David Cameron is to crack down on extremism in schools and mosques, and to fight radicalism over the internet. In a statement from Downing Street, the aim is to disrupt the poisonous narrative of hard line clerics.