Survivors and relatives will remember those killed and injured in the July 7 bombings in London on the fifth anniversary of the terrorist attacks.
The atrocities carried out by Islamic extremists on Tube trains and a bus in 2005 left 52 innocent people dead and more than 700 injured.
No official events are planned to commemorate the anniversary, although wreaths will be laid on behalf of Prime Minister David Cameron and London Mayor Boris Johnson at the Hyde Park memorial to the victims.
Many survivors and bereaved families will mark the day with private gatherings at the memorial and the sites of the four blasts.
The lack of an official ceremony has upset many of those affected by the tragedy, according to Graham Foulkes, whose 22-year-old son David was killed in the Edgware Road bombing.
Mr Foulkes said: "I am very disappointed. This was an attack against the country. This is the fifth anniversary, a significant one, but even the Mayor of London will not be present. I don't think any of us are saying we want this to become an annual major event, but I think on the fifth anniversary the least the Prime Minister could do is attend and lay a wreath. This was a national attack, and it's really disappointing. I know it's upset many people."
Later, in a hand-written note attached to the wreath laid at the memorial on behalf of the Government, Prime Minister David Cameron said: "In memory of the victims of terrorism in London on 7 July 2005. They will never be forgotten."
Transport for London is organising private rooms and trained support staff for bereaved relatives and survivors near the sites of the three Tube bombings.
The Department for Culture, Media and Sport (DCMS), which is responsible for organising 7/7 memorials, said none of the families had contacted it since last year asking for an official event to mark Wednesday's anniversary. A spokeswoman for Mr Johnson said the Mayor followed the advice of the DCMS on marking the anniversary.
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The National Muslim Women's Advisory Group issued a statement "deploring" the actions of the 7/7 bombers and saying that what they had done could "never be justified" in the name of Islam. "Today our thoughts are with all those who have been affected by this tragedy and continue to suffer from its outcome either directly or indirectly," it said.
