NEW : Syria claimed Israeli missiles struck at its military facilities on Sunday . Syrian prime minister : Assad must leave power There is no information suggesting rebel use of sarin , a State Department official says . Israel conducted airstrikes in Syria on Sunday and last week , a U.S. official tells CNN . Reports of Israeli strikes are `` very worrying , '' the Russian Foreign Ministry says .
NEW : Syrian prime minister : Assad must leave power There is no information suggesting rebel use of sarin , a State Department official says . Israel conducted airstrikes in Syria on Sunday and last week , a U.S. official tells CNN . Reports of Israeli strikes are `` very worrying , '' the Russian Foreign Ministry says .