HONOLULU, Jan. 8 -- A nuclear submarine ran aground about 350 miles south of Guam, injuring around 20 sailors, one of them critically, the Navy said.
The USS San Francisco sustained severe damage, but there were no reports of damage to its reactor plant, which was operating normally, the Navy said.
The 360-foot submarine was headed back to its home port in Guam, where it was expected to arrive Monday.
Jon Yoshishige, a spokesman for the Pacific Fleet based at Pearl Harbor, said there was no information yet on what the submarine struck.
Details on the sailors' injuries were not available, but Yoshishige said an initial assessment put the number injured at about 20. The sub has a crew of 137, officials said.
Navy and Coast Guard aircraft from Guam were en route to monitor the submarine and assist if needed, the Navy said.