SAN FRANCISCO (KRON) -- A lockdown issued on Thursday at San Francisco State University has been lifted, KRON4.com has confirmed. Earlier, on Thursday afternoon, the University Police Department received an anonymous threat to campus. An alert to shelter-in-place was sent through text messages and social media shortly before 12:30 p.m. “If you are not on campus do not come,” SF State said in an announcement. Activities and classes for Thursday are canceled, and affected finals tests will be rescheduled, university officials said. "For those who are on campus please shelter in place immediately or go to a secure location," university police said. Authorities are advising people to stay away from windows and doors and to remain in place until further instructions. As of 4 p.m., the shelter-in-place order was lifted after university police and local agencies completed a search with no credible threat discovered to the campus or community. With classes, finals, and activities canceled for the day, regular activities are to resume Friday. Students and employees whose job duties allow may leave campus, officials said. Those who need to return to campus to retrieve belongings may also do so.