The Duchess of Cambridge is speaking out after London’s deadly terror attack claimed the lives of three people and injured dozens more on Wednesday.

While attending the launch of a film series created by Best Beginnings — a charity that partners with her Heads Together initiative — the duchess expressed her sympathy for the victims and the families affected by the attack.

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“Before I begin, I know you would all want to join me in sending our thoughts and prayers to all those sadly affected by yesterday’s terrible attack in Westminster,” she said at the event taking place at the Royal College of Obstetricians and Gynaecologists, only miles from Wednesday’s atrocities. “We will be thinking of all the families, as we discuss the important issues we’re here to talk about.”

Middleton went on to deliver a speech that touched upon the importance of maternal mental health while sharing her own struggle with the matter. “Personally, becoming a mother has been such a rewarding and wonderful experience,” Kate said. “However, at times it has also been a huge challenge — even for me who has support at home that most mothers do not.”

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Wednesday saw the Queen and Prince Philip cancel their scheduled appearance at New Scotland Yard, where the Royals were set to open the Metropolitan Police’s new headquarters. “Following the shocking events in Westminster, Prince Philip and I are sorry that we will not be able to open the New Scotland Yard building as planned today, for very understandable reasons,” a statement from the Queen read. “My thoughts, prayers, and deepest sympathy are with all those who have been affected by yesterday’s awful violence.”