Canadian Prime Minister Justin Trudeau says his government had no involvement in the arrest of a top executive from Chinese telecoms giant Huawei, BBC reports.
Meng Wanzhou, Huawei's chief financial officer and the daughter of its founder, was detained at Vancouver airport on a US extradition request.
China has demanded her release, calling the arrest a human rights violation.
The charges have not been made public. Huawei said it was "not aware of any wrongdoing by Ms Meng".
She faces a bail hearing on Friday.
The arrest comes at a sensitive time for US-China relations. The nations are locked in a trade war that has seen both impose duties on billions of dollars of one another's goods.