British Muslims remembered those who died in London's bomb attacks at a silent vigil on Sunday.
Flowers have been left at the bomb sites
Organised by the British Pakistani Psychiatrists Association, it was held in Hyde Park, near Marble Arch.
A spokesman said it was important that British Muslims showed they were "law abiding and patriotic".
Meanwhile a Muslim youth conference was being held near Regent's Park to raise awareness of extremism and exclusion in society.
Professor of Islamic Studies Dr Tariq Ramadan was among those addressing The Middle Path conference at the Islamic Cultural Centre in north-west London on Sunday.
Dr Ramadan told BBC News that Muslims had to speak out to "condemn what must be condemned" and work with police.
"We have to promote the understanding that, as British citizens, and Muslims at the same time, you have to be involved in the process to act against this because these are our common enemies, these people are undermining the future of our society," he said.
But, he added, the government had to speak to Muslims who were connected with the community, not just those who "are saying exactly what you want to hear".
'Grief and solidarity'
Metropolitan Police chief Sir Ian Blair defended inviting Dr Ramadan, who has been accused of supporting attacks in Israel and Iraq, saying his was an important voice to which young radicalised Muslims might listen.
The four bombers killed themselves and 52 others in the attacks on London's transport system on 7 July.
The BPPA spokesman said before the Hyde Park vigil: "We the British Muslims are law abiding and patriotic citizens and are very much a part of the mainstream as anybody else in this wonderful and democratic country.
"We need to publicly express our grief and solidarity with the victims of this crime and their families."