A woman who allegedly ran amok at a mining office in the Perth Airport precinct has been extracted from a roof space where she was hiding and has been taken, screaming, into an ambulance.

It is understood she is being taken for a mental health assessment.

The scene at Byrnecut Mining, where police evacuated the building due a possible explosives threat.

Police negotiators rushed to the office in George Wiencke Drive after a female employee was said to have run amok, hidden in a roof space and threatened to kill.

It is understood that police had to cut their way into the office roof space. She was eventually freed when the ceiling was cut and she fell safely onto crash pads.