The Santa Clara County fire department’s incident report shows a fire alarm and hazmat response at Apple’s headquarters just after noon local time.

Emergency personnel have determined that the situation is under control, and employees have been allowed to go back inside. It’s unclear what the substance may have been.

Apple told employees at Apple park that’there was no presence of hazardous materials’. The email says that operations at the campus are back to normal, and that’all sections are open’.

Apple rescheduling return-to-office plans for its employees several times. Will start a’phased approach’ to its hybrid work pilot in April.

Added incident report info from sccfddddddddddddddddd.