Police and school officials lifted the lockdown Thursday just before 2 p.m., allowing students with cars to leave the campus, and then allowing students whose parents congregated outside of the campus to leave.
School officials canceled on-campus events, and relocated or postponed athletic events that were scheduled on campus.
The chain of events Thursday started when police received a call from a father of a Torrey Pines student at 10:25 a.m. who said his son texted him that there was a shooter on campus. The father received a subsequent text from his child, who said that the threat was reportedly made online.
Police placed the school under lockdown and are currently going through each classroom to ensure the campus is safe. The first units arrived on the scene one minute after the first call.
Officers confirmed that there was not an active shooter on campus, but have not said when the lockdown will be lifted.
The threat reportedly was made on the social media site Yik Yak, but police were unable to confirm it at the current time.
Yik Yak, a controversial site that allows users to make anonymous posts that can be read by other users within a 1.5-mile radius, has been the source of several anonymous threats that have disrupted other campuses across the country, including one in Southern California.
Mira Costa High School in Manhanttan Beach was shut down two days this week after the school received anonymous threats on the Web site.