The 32-year-old woman was arrested last week on suspicion of preparation of terrorist acts and had been on bail.
Flowers are seen placed outside of the Houses of Parliament in remembrance of victims eight days after a man drove his auto into pedestrians on Westminster Bridge then stabbed a police officer in London, Britain, March 30.
The 12 people who were arrested in connection with the Westminster terror attack have been released without charge.
They were Kurt Cochran, aged 54, Aysha Frade, 44, PC Keith Palmer, 48, and 75-year-old Leslie Rhodes.
"The inquests into the deaths of the victims of the Westminster terrorist attack opened and adjourned on March 29 under the authority of Senior Coroner for Westminster Fiona Wilcox".
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London Metropolitan Police said on March 27 that there was no evidence indicating Masood was associated with either the IS or al-Qaeda (also banned in Russia).
Khalid Masood, 52, killed three people on 22 March in Westminster before fatally stabbing a police officer.
In total, his attack lasted 82 seconds.
The inquest heard before he died, Masood drove his hire auto across Westminster Bridge and mounted the pavement twice "in an apparently deliberate attempt to target pedestrians". The Islamic State (IS) terrorist group, outlawed in Russian Federation, claimed responsibility for the attack.