NEW CASTLE, N.H. — The U.S. Coast Guard is working to determine why an oil tanker hit three moored sailboats in a river on the Maine-New Hampshire border. The collision happened Wednesday at the mouth of the Piscataqua (pih-SKAT’-ah-kwah) River near Kittery, Maine, and Portsmouth, New Hampshire. Officials say the 477-foot Chem Venus tanker was
