From the Collin College CougarAlert:

5:02 p.m. - Collin College received a bomb threat at Preston Ridge Campus for Founder's Hall and the Library. Please evacuate Founder's Hall and the Library Building at Preston Ridge immediately.

5:32 p.m. - Collin College is evacuating all of Preston Ridge Campus due to bomb threat. Evacuate PRC  immediately. Classes @PRC canceled tonight.

7:27 p.m. - Collin College Preston Ridge Campus ALL CLEAR. PRC remains closed but classes resume Friday. 

For details, see collin.edu.