By LOLITA C. BALDOR, ANNABELLE LIANG and STEPHEN WRIGHT

SINGAPORE (AP) — The U.S. Navy ordered a broad investigation Monday into the performance and readiness of the Pacific-based 7th Fleet as vessels from several nations searched Southeast Asian waters for 10 missing U.S. sailors after an early morning collision between the USS John S. McCain and an oil tanker. Navy ships have been in at least four accidents in the Pacific this year:

The commander of the USS Antietam was relieved of duty after the guided-missile cruiser ran aground while it was anchoring near Yokosuka base, the home port of the U.S. Navy's Japan-based 7th Fleet. It came just days after the US Navy issued a damning report listing errors that led to a collision in June between the USS Fitzgerald and a container ship south of Japan, which flooded berthing compartments and killed seven sailors. Navy Adm. John Richardson, the chief of naval operations, will call for a pause in operations and seek a deeper look at how the Navy trains and certifies its forces that are operating around Japan, according to a Naval official. The Japan-based fleet said the McCain was heading to Singapore for a routine port visit at the time of the collision and the ship was heading to port under its own power. The McCain had been heading to Singapore on a routine port visit after conducting a sensitive freedom-of-navigation operation last week by sailing near one of China's man-made islands in the South China Sea.
The U.S. Navy orders an investigation into its Pacific Fleet following the collision, which is the fourth crash involving a U.S. Navy ship in the past two years and the second in the past two months.