The Mill Valley Police Department said that the lockdown at Tam High has been lifted, as well as the shelter in place command for a 1/4 mile radius. All students, according to police, were unaffected and were "released as usual".
Earlier, the Mill Valley Police Department tweeted that the school had been put on lockdown amid a "police action at Tam High", calling on residents within 1/4 mile of the site to "shelter in place". Police later tweeted that all students were safe.
Netizens shared footage alleged to be from the site.