Iran says at least seven people, including four children, have been killed in missile strikes by Pakistan on Iranian soil, two days after Iran launched its own strikes in Pakistan.

Pakistan had warned Tehran there would be “serious consequences” for Tuesday’s attack, which it said killed at least two children in western Pakistan.

Multiple blasts were heard in Iran’s southeastern province of Sistan-Baluchistan on Thursday, according to state news agency IRNA.

Pakistan’s foreign ministry said it had conducted air strikes targeting Baloch separatist groups inside Iran. Several missiles hit a border village, officials in Tehran said.