Facebook Inc. said Tuesday it had identified a new coordinated political influence campaign to mislead its users and sow dissent among voters ahead of U.S. congressional elections set for November.

The firm said it had removed 32 pages and accounts from Facebook and Instagram, in part of an effort to combat foreign meddling in U.S. elections.

The company stopped short of identifying the source of the misinformation, but members of Congress who had been briefed by Facebook on the matter said the methodology of the influence campaign suggested Russian involvement.