Columbia limits access to Morningside campus
Columbia University said it has limited access to its Morningside campus except to students residing in seven residential buildings, labs and employees who provide essential services.
The school has also limited access into and out of the building to one gate, closing all other campus entry points.
The restrictions will remain in place "until circumstances allow otherwise," Columbia said.
New York Police Department officers said they would not enter the property unless Columbia requests it, or there is an imminent threat.