But she said it was "difficult to escape a very sombre national mood"
She said: "Today is a traditional day of celebration. This year, however, it is very difficult to escape a very sombre national mood. Put to the test, the UK has been resolute in the face of adversity".
In her traditional birthday message, the 91-year-old monarch made a reference to the "succession of terrible tragedies", a day after she paid a visit to people affected by the massive Grenfell Tower blaze in west London that has claimed at least 30 lives.
"United in our sadness, we are equally determined, without fear or favour, to support all those rebuilding lives so horribly affected by injury and loss," she said.
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Her message came as firefighters continue their search at the site of the fire in north Kensington, where a 24-storey residential block was burnt to the core within minutes early on Wednesday.
Grief has since given way to anger as protests were held in London on Friday by residents demanding more support for those affected by the fire.
Between 50 and 60 people stormed Kensington and Chelsea Town Hall as members of the public demanded the council, which owned the tower blocks, to give reassurances to the victims.
Dozens of demonstrators surged towards the entrance and there were scuffles outside as organisers appealed for calm.
British Prime Minister TheresaMay has faced criticism for not meeting survivors in the immediate aftermath of the major fire, which has rendered hundreds homeless, unlike Labour leader Jeremy Corbyn and London mayor Sadiq Khan who met with the locals on their site visits.
May has committed 5 million pounds for clothes, food and emergency supplies as part of Grenfell Tower Residents' Discretionary Fund on Friday, which includes the aim to re- house residents within three weeks as close to where they lived before as possible, to pay for temporary housing in the meantime and to provide extra financial assistance.
"The government is making money available, we are ensuring we are going to get to the bottom of what has happened, we will ensure that people are re-housed. We need to make sure that actually happens," she said.
On Friday, hundreds of mourners stood arm in arm at a vigil in west London and held a two-minute silence for the victims of the fire.
Scotland Yard is leading the criminal investigation into the fire at Grenfell Tower to establish the exact cause of the fire.
The UK government has already announced a full judge-led public inquiry in an attempt to learn lessons from the tragedy and implement any necessary fire measures in other residential towers blocks.
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