Video report by ITV News' Neil Connery
A service has been held to remember the thousands of men and boys killed in the Srebrenica massacre 20 years ago.
More than 8,370 Bosnian Muslims were killed in July 1995 - the worst massacre in Europe since the Second World War.
Some 2,000 guests saw 20 candles being lit in memory of the victims at Westminster Abbey on Monday morning.
Nedzad Avdic, who was 17 when he saw his father and uncles murdered, told ITV News: "They destroyed our community and destroyed my life and my family.
"They shot my father and my uncles and it's very difficult talking about it but I have two daughters and everyday they ask me about things and I have to tell them the truth."
Bosnian Serb forces took control of Srebenica - which was supposed to be a United Nations safe haven - before killing men and boys and burying them in mass graves.
Munira Subasic lost 22 relatives in the massacre.
She told ITV News: "I can't share the things I've been through with anyone else.
"The only thing I can say is that I wouldn't wish this on anyone not even those who committed these crimes against me."