A man claiming to be an al-Qaeda militant, who has taken hostages in a French bank, has fired a shot and could be holding up to four people, according to sources.
In March, an al-Qaeda-inspired gunman shot dead three soldiers, a rabbi and three Jewish children in Toulouse. The man was later shot dead by police after a standoff at his home in the city.
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Tony Davies was the first civilian to reach Pc Palmer after he was stabbed during the Westminster attack.
Defiant Londoners put on a show of solidarity for the victims of the Westminster terror attack at a vigil in their honour.
Weather set to improve with plenty of sunshine by Saturday