Yale spokesman Thomas Conroy told local newspaper the New Haven Register, “Everyone is following instructions they were given in these alerts".
The Yale alerts warning an emergency situation is in place are sent by email, text message and phone.
Everyone in our community receives these alerts ... Everyone is alerted in multiple ways,” he added.
Students at Yale University have been on break since Saturday and classes do not resume until 2nd December.
More top news
It comes after the government announced international GCSEs, which many private schools use, would be dropped from the league tables.
Rape suspects will need to prove to police that a woman consented to sex under fresh new guidance in sex offence cases.
Dippy the Diplodocus is to forced into retirement and moved out of the Natural History Museum's main hall.