Iranian artillery fired more than 180 shells into northern Iraq, targeting Kurdish rebel bases, the Iraqi government said Sunday.
The shells landed near the Iraqi village of Haj Omran, which is about five kilometers (three miles) inside the Iraqi-Iranian border, Iraq's Ministry of Defense said.
No casualties were reported.
Iran launched a similar attack on Kurdish rebel positions in the same area on April 21, also causing no casualties or damage, Kurdish officials said.
Kurdish rebels fighting Iranian forces operate from Iraqi territory and have been active recently, mounting attacks against Iranian army and Revolutionary Guard posts.