WASHINGTON — A U.S. official says the Obama administration will hit the Iranian economy with new sanctions Monday, teaming with Britain and Canada in an effort to pressure Tehran to halt its suspected nuclear weapons program.

The official says the financial and energy sanctions will target Iranian companies, the hardline Revolutionary Guard force and Iran’s petrochemicals sector.

The official spoke on condition of anonymity because of the sensitivity of the issue.

The official says the sanctions will likely be announced later Monday by Secretary of State Hillary Rodham Clinton. Britain and Canada are also expected to announce actions to pressure Tehran to come clean on its nuclear program. Iran says it’s for peaceful purposes.

The moves come after a U.N. nuclear agency’s recent report suggesting Iranian work on an atomic weapons program.