Human Rights Watch has accused Saudi-led coalition forces of using cluster bombs that are illegal under international law in its conflict with Houthi rebels in Yemen. In a statement released on Wednesday, HRW said the coalition troops used cluster munition rockets in at least seven attacks between April and July in Yemen's northwestern Hajja governorate, killing and wounding dozens of civilians.

Air strikes by a coalition of Arab nations on Saada city in Yemen are in breach of international law, despite calls for civilians to leave the area, the UN Humanitarian Coordinator for Yemen said. "The indiscriminate bombing of populated areas, with or without prior warning, is in contravention of international humanitarian law," Johannes van der Klaauw said in a statement on Saturday.

The Saudi-led military coalition fighting a rebel group in Yemen has in the past few weeks used cluster munitions supplied by the United States, Human Rights Watch said in a report released on Sunday. The report said video, photographs and other evidence showed that the coalition had used cluster bombs near villages in Yemen s northern Saada Province. The group, which said it had found evidence that the weapons had been deployed on at least two separate occasions, has not been able to establish whether any casualties had resulted from their use, according to the report.

Clashes in Yemen have forced up to 15,000 people from their homes since mid-July, with some even sheltering in caves, according to the latest U.N. report on humanitarian needs in the Arab country.

After Yemen s Republican Guard killed and dismembered tribal prisoners Thursday, Arhab tribesmen issued a statement Friday demanding the immediate arrest and prosecution of General Ahmed Saleh as a war criminal