(CNN) – A Saudi-led coalition rained down missiles in Yemen from Friday into Saturday, an intense attack that a U.N. official called a breach of international humanitarian law. The Saudi Press Agency reported that the latest attack against Houthi rebels in Yemen — 130 airstrikes in a 24-hour period — included the targeting of schools and hospitals. The hospitals and schools that were hit functioned as weapons storage sites, coalition spokesman Brig. Gen. Ahmed Asiri said in a statement.