In battles with Shiite rebels in its north . Iran foreign minister expressed concern for Yemen 's territorial integrity . The U.N. High Commissioner for Refugees estimates as many as 175,000 people have been affected by the conflict since 2004 , U.N. spokesman Farhan Haq said Tuesday . Saudis launched airstrikes against Yemen .
In battles with Shiite rebels in its north . Iran foreign minister expressed concern for Yemen 's territorial integrity . Saudis launched airstrikes against Yemen .