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Family question why driver shot

The family of Miriam Carey, the 34-year-old woman shot dead following a dramatic car chase through the streets of Washington that caused a lockdown on Capitol Hill, have said they do not understand why she was shot, when she was unarmed.

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Senate uses new Twitter Alerts in Capitol lockdown

During the brief time that the Senate was in lockdown during an incident which saw shots fired, security used the new Twitter Alert to make sure those inside the building had the most recent and reliable information:

The new system was unveiled by Twitter last week as a more effective way to highlight critical information for users.

Find out more about the Twitter Alerts system.

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