Israeli media reports said Iran again used cluster munitions in a new missile attack on the Tel Aviv metropolitan area early on Monday.

There were around 20 impact sites in the vicinity of Tel Aviv, ynet news site reported. Several people were injured, including one woman who sustained serious injuries, the Magen David Adom emergency services said. A school in the city of Tel Aviv was also hit.

A military spokesman also said it was highly likely that cluster munitions had been used.

In the north, too, there were around 10 impact sites in the Haifa area after an Iranian attack using cluster munitions, ynet reported. It said several cars caught fire.

During the night, two people were recovered dead from a building in Haifa after an Iranian missile hit the site in an earlier attack.

Non-governmental organization Human Rights Watch recently condemned Iranian attacks using cluster munitions on Israeli cities, saying this could be a war crime.

"Iran's use of cluster munitions in populated areas in Israel [poses] a foreseeable and long-lasting danger to civilians," said Patrick Thompson, crisis, conflict and arms researcher at Human Rights Watch.

"Cluster munition bomblets are dispersed over a wide area, making them unlawfully indiscriminate in violation of the laws of war," he said.