The U.N. Security Council has voted to extend the mandate of inspectors charged with determining who is behind confirmed chemical weapons attacks in Syria.

A resolution passed Monday extends the inspectors' work until mid-November with the possibility of a further extension before the mandate's expiration.

Investigators have already determined that the Syrian government was behind at least three chemical weapons attacks and the Islamic State was responsible for at least one.

The United States, Britain and France want the Security Council to impose sanctions on the Syrian government for using chemical weapons. But Russia, Syria's closest ally, has repeatedly questioned investigators' conclusions linking chemical weapons use to the regime of President Bashar Assad.