King Charles has praised the "extraordinary courage and compassion" shown in the wake of the 7/7 terrorist attacks

He said in a statement: "Today, as we mark 20 years since the tragic events of 7th July 2005, my heartfelt thoughts and special prayers remain with all those whose lives were for ever changed on that terrible summer's day.

"We remember with profound sadness the 52 innocent people who were killed in senseless acts of evil - and the enduring grief of their loved ones. We recall, too, the hundreds more who carry physical and psychological scars, and pray that their suffering may ease as the years pass.

"In doing so, we should also remember the countless stories of extraordinary courage and compassion that emerged from the darkness of that day.

"The selfless bravery of our emergency services, transport workers and fellow citizens who rushed towards danger to help strangers reminds us of the very best of humanity in the face of the very worst."

The king also stressed the importance of communities coming together with "mutual respect and understanding" in the face of division.

He said: "While the horrors will never be forgotten, we may take comfort from the way such events rally communities together in solidarity, solace and determination.

"It is this spirit of unity that has helped London, and our nation, to heal.

"As we remember those we lost, let us therefore use this 20th anniversary to reaffirm our commitment to building a society where people of all faiths and backgrounds can live together with mutual respect and understanding, always standing firm against those who would seek to divide us."

The king's brother, Prince Edward, the Duke of Edinburgh, and his wife Sophie, Duchess of Edinburgh, will represent Charles at a national service of commemoration at St Paul's Cathedral in London on Monday morning.