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Yale University 'gun alert' over

Yale University in the US state of Connecticut has lifted its security alert after an anonymous 911 call claimed their room-mate was heading to the campus "with the intention of shooting people".

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Police begin door-to-door search for Yale gunman

Police are going door to door at Yale University to search for a gunman on campus, a spokesman has warned.

Yale University urged students and staff to co-operate, warning, "When they knock on your door, a Yale police officer will slip their Yale ID under the door".

Police have begun a door-to-door search for the gunman.

"Police may use keys, but they will identify themselves", the university website added.

Libraries and some public schools are also on lockdown as the search continues, New Haven Police Department spokesman David Hartman said.

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