inputs: hypothesis: Pirates damaged the ship Liberty Maritime. premise: NEW YORK —  Somali pirates attacked and damaged an American ship carrying humanitarian aid Tuesday, but the ship and crew were safe under Navy escort, the military and shipping company said. The pirates fired rocket-propelled grenades and automatic weapons at the Liberty Sun as it carried food for famine-wracked African nations, said the vessel's owner, Liberty Maritime Corp. The ship was en route from Houston to Mombasa, Kenya, with a roughly 20-member crew, officials said. .