Iran says it's willing to enter another round of talks with the U.S. over Iraq security.

Iran and the U.S. have held three rounds of ambassador-level talks on Iraqi security in Baghdad since last May.

Foreign Ministry spokesman Mohammad Ali Hosseini said Monday that Iran will "continue the talks with necessary conditions."

He says the U.S. sent an official request for talks through the Swiss Embassy in Tehran because Washington and Tehran have no formal relations.

Hosseini did not a give possible time for the next round of talks.

Washington accuses Iran of funneling arms to extremist groups in Iraq, but Tehran denies that.

Iran holds considerable sway in Iraq, where the majority of the population is also Shiite Muslim and where Shiite political parties have close ties to Tehran.