The mother of a man missing since Thursday's London bombings has condemned the attackers.
Anthony Fatayi-Williams' mother, Marie, said: "I am his mother. I need to know what happened to Anthony."
She said it was time to stop "this vicious cycle of killing". "How many mothers' hearts shall be maimed?"
It is thought he took the Number 30 bus after stopping to help Tube passengers. The bus was blown up in Tavistock Square.
'Hopes and dreams'
Surrounded by family and friends of her son at the scene of the bus bombing, Mrs Fatayi-Williams said: "Five days on and we are waiting to know what has happened to him."
"My son Anthony is my first son, my only son, 26, the head of my family.
"In African society, they hold on to sons. He has dreams and hopes and I his mother must fight to protect them."
She said anyone who believed they were acting in the name of God or Allah by committing such atrocities had been misled.
The commuters targeted by the terrorists were not "warriors", she said. "Terrorism is not the way. We cannot deliver peace by killing people."
Referring to previous terrorist attacks, Mrs Fatayi-Williams added: "Now New York, now Madrid, now London, there has been widespread slaughter of innocent people.
"There have been streams of tears, innocent tears. There have been rivers of blood, innocent blood."
She provided a stark contrast between the bombers and leaders such as Nelson Mandela who offered inspiration to many.
"What inspiration does senseless slaughter provide?" she asked.
And she used her son as an example to say that all faiths and communities must join together to defeat terrorism.
"Anthony is a Nigerian who was born in London and worked in London. He is a world citizen.
"Today we have Christians, Muslims, Jews, Sikhs, Hindus - all of us united in love for Anthony.
"Hatred begets only hatred. It is time to stop this vicious cycle of killing. We must all stand together for our common humanity."
Mrs Fatayi-Williams flew to the UK from Nigeria to try to find her son, an oil executive working at Amec Offshore Services near Liverpool Street station.
On the morning of the attacks, he was on his way to his office, but took a different route to work, via King's Cross, because of delays on the Northern Line.
The family believe witnesses later saw Anthony in Euston amid the confusion following the Tube attacks, helping passengers find buses.
His mobile phone records show he contacted his employer at 9.41am to tell them he would not get to work by Tube but would find another way.
The bus bomb exploded six minutes later.
His best friend Amrit Walia had contacted the BBC News website after he went missing following Thursday's bombings.