Authorities in northwestern Ontario are warning relatives of a missing Toronto woman not to try to conduct their own search of a rugged provincial park.

Seven of Christina Calayca's relatives drove straight through the night Monday to reach Rainbow Falls Provincial Park near Schreiber, on the north shore of Lake Superior about 200 kilometres east of Thunder Bay.

A poster shows Christina Calayca, 20, who was last seen one week ago.
(Canadian Press)

Calayca's father and cousin admitted to packing two-way radios and discussing plans to go into the bush with GPS tracking systems.

The 20-year-old Calayca was last seen seven days ago when she went for an early-morning jog while on a camping trip in the park.

The family said it wants to convince Ontario Provincial Police to keep looking for her and to let them help. They joined the young woman's mother and several uncles who are already helping with the civilian search.

Sgt. Debra Tully said it would be inappropriate to let family members enter steep and densely forested areas of the park, where searchers are being flown in.

"We cannot, unfortunately, allow the family members or untrained volunteers to be proceeding or assisting with the physical search with our search teams," Tully told CBC News.

About 70 people, including police officers and trained search-and-rescue personnel, are involved in the search effort every day, Tully noted. 

A police underwater search unit was brought in Sunday and searchers continued Monday to scour bodies of water in the park.