Yale University has warned its students and staff it remains on lockdown and they should continue to "shelter in place" if on campus.
"IF OFF CAMPUS, STAY AWAY", the university's website warns.
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The MK912 spitfire was forced to make an emergency landing soon after taking off.
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A mass inhalation of "hippy crack" was carried out in the shadow of Parliament on Saturday in protest at the Government's drug policy.