MOGADISHU, Somalia - A cargo ship carrying food for poor Somalis refused to leave Kenya on Monday because of rampant piracy, and the U.S. Navy warned vessels to stay clear of Somalia's lawless waters where everyone from aid workers to fishermen have become targets. The U.N. World Food Program has appealed for international action to stamp out Somali pirates threatening the delivery of humanitarian supplies to the Horn of Africa country, which is trying to recover from the worst fighting in more than a decade.The ship was loaded with 850 tons of food, but the shipping agency contracted by the WFP demanded the Kenyan government provide security for travel into Somali waters. On Saturday, pirates staged a failed hijack attempt on another WFP boat, killing a Somali guard. "We need some sort of security to ply into Somali waters ... because they (Somali pirates) are everywhere. Now they are ashore, (and) very far off into the sea. It is becoming too much," Inayet Kudrati of the Motaku Shipping Agency said Monday.