World Championship 400 metre champion Christine Ohuruogu has tweeted her thanks to fans after her photo-finish
Six years after winning her first world crown, the British athlete recovered from a terrible start to surge down the home straight and pip reigning champion Amantle Montsho to the line.
Mo Farah has booked his place in the Men's 5000m final at the IAAF World Championships.
Farah, who became the first British man to win a 10,000m gold medal at a World Championship this weekend, crossed the line today in 13.23.93 and took the fifth qualifying place.
Defending champion Farah will compete in the 5000m final in Moscow on Friday evening.
London's Christine Ohuruogu has won the 400 metre final at the World Athletics Championships in Moscow today.
London athlete Perri Shakes-Drayton has made it into the semi-finals of the 400 metre hurdles at the World Championships in Moscow.
The British number one has the third-fastest in the world so far this year behind favourite Zuzana Hejnova of the Czech Republic and the USA's Kori Carter who is absent from the championships.
London's Christine Ohuruogu has booked her place in the World Athletics Championships 400 metre final in Moscow tomorrow.
A perfectly timed late surge ensured the semi final win. She posted a time of 49.75.
London athlete Christine Ohuruogu will take to the race track in Moscow today in the semi finals of the women's 400m race.
Mo Farah told the BBC "it was great to come here and win the one that was missing,"
Rival distance runner, Ibrahim Jeilan, who beat Farah for the title in the last World Championships in 2011 was hot on his heels throughout the race.
Mo admitted: "I had the experience of a couple of years ago. This time I saw Jeilan coming...I was digging in and digging in, looking across. I knew I had won only when I crossed the line."
It is thought that he will compete again next week to try and regain his 5,000m. If he managed to win it, he would recreate his iconic double gold win at the London Olympics last year.
Mo Farah has once again carried the hopes of the nation over the finish line at the Athletics World Championships in Moscow. He beat rival Ibrahim Jeilan to win in 27 minutes 21.72 seconds.
The widow of poisoned spy Alexander Litvinenko tonight accused a coroner of abandoning "his search for the truth about Russian state responsibility for her husband's death".
Marina Litvinenko's criticism comes after Sir Robert Owen revealed he cannot hear in public evidence linked to the alleged involvement of the Russian government.
The ruling was published after the coroner accepted an application by the UK Foreign Office to keep certain information under wraps.
A statement from Mrs Litvinenko's solicitors described the decision as "a tragedy for British justice".
It added that it set a "frightening precedent" for all of those trying to "expose the crimes committed by conspiracy of organised criminals that operate from the Kremlin."
Alexander Litvinenko was a Kremlin critic who left Russia in 2000. He died an excruciating death in hospital three weeks after drinking a cup of tea laced with the radioactive isotope polonium-2010 during a meeting with two men at the Millennium Hotel in Grosvenor Square in 2006.
Alex Goldfarb, a friend of the Litvinenko family and his widow Marina, said the decision this afternoon was "deeply dismaying", and that it was "upsetting" that in his view British government had prioritised its political relationship with Russia over the need to hold an open inquest.
"It appears the British government is more concerned about the use of chemical weapons in Syria than radioactive weapons being used on the streets of London."
However Mr Goldfarb added: "On the other hand, it's an admission by the British government that the Russian state is culpable because otherwise they would not have requested immunity. That in itself is a partial victory for Marina. [Litvinenko's widow]"
His family believes he was working for MI6 at the time and was killed on the orders of the Kremlin.
The coroner's ruling was published today after he accepted an application by the UK Foreign Office to keep certain information under wraps.
Evidence cannot be heard in secret as part of an inquest, but could be as part of a public inquiry.
Sir Robert said: "It is my present view that I should hear submissions as to whether I should invite the Secretary of State (the Home Secretary) on behalf of Government to consider whether the power to hold an inquiry should be exercised in this case."
He said that the issues of preventability and Russian involvement are of "central importance" to the investigation into Mr Litvinenko's death.
Addressing the first issue, he said his duty to carry out "a full, fair and fearless investigation" would be hampered if it was not included.
He also said that excluding key evidence on the issue of Russian involvement would cause him "grave concern".
The coroner went on: "Were an inquiry to be held into the circumstances of Mr Litvinenko's death, the relevant material could be taken into account."