The FTSE 100 Index fell 117.9 points, or 2.1%, to 5533.9 amid worries that a raft of Spanish regions were poised to ask for government bailout funds, increasing the likelihood that the country itself will turn to the EU for help.
The fall wiped nearly £30 billion from the value of London's leading shares index, with all 100 companies losing value and banks falling up to 4%.
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The 16-year-old, who has a social media following of over 15 million people, suffered two fractured ribs, a bruised lung and concussion.
Newly appointed minister Lord Ahmad pledged to review passenger screening procedures amid a spate of drunk passenger incidents.
The outspoken Birmingham MP tweeted a picture of locksmiths ramping up security at her home after facing fresh intimidation on social media.