Pirates from two small skiffs seized the crew of a Japanese vessel off anarchic Somalia's coast. American forces fired on the skiffs and destroyed them. Now the navies of the U.S. and 19 other countries are after bigger prey. The U.S.-led coalition working to secure sea lanes beset by pirates believe skiffs like the ones used in the attack on the Japanese ship must have come from elusive "mother ships." "The small boats which are used for piracy could not travel" from shore as far into the ocean as ships have been attacked, said Commodore Khan Hasham of Pakistan, one...