TORONTO -- A woman who climbed up a construction crane and onto a dangling pulley in Toronto was rescued Wednesday morning after a dramatic hours-long operation. Here are five things to know about the rescue.

WHERE: The crane was at a construction site in the heart of downtown Toronto, on Wellesley Street near Yonge Street. The pulley device the woman was on measured about 15 centimetres by 60 centimetres.

WHEN: Fire officials say crews were called to the scene around 4 a.m. ET. The temperature at the time was about 5C. A rescuer reached the woman at 8 a.m. and both touched the ground about half an hour later.

WHO: The woman is believed to be in her mid-20s. Her identity is not known.

THE RESCUE: A firefighter climbed to the top of the crane and rappelled down to the pulley device the woman was sitting on and strapped a harness to her. They both rappelled to the ground together.

WHY: Fire crews believe the woman climbed up the crane, crawled out on the end of it and slid down a cable to the pulley device. There was no immediate indication as to why the woman climbed atop the crane.