They probably lifted the shelter in place since it’s contained to the parking garage. I would continue to shelter in place until the situation is fully under control. Did LEO confirm the shelter has been lifted or was it sent out by the OSU twitter account? Anything can be hacked...
It seems OSU people lifted the shelter in place. I just heard the police want to reinstate the shelter in place. The police scanner is raising exactly what you indicated, wanting to know who lifted it.