SEOUL, South Korea - Military divers are hoping to rescue survivors from a sunken naval patrol boat after finally locating the ship's stern.
The ship sank near the sea border with North Korea on Friday, following an explosion that broke the 1,200-ton Cheonan naval patrol vessel in two.
Strong currents and poor underwater visibility had hampered rescue efforts, according to a BBC report.
South Korean authorities said there is no evidence that the North was involved in the incident.
Divers are hoping to rescue at least some of the 46 crew members who may be trapped in underwater air pockets.
North Korea warned that allowing journalists to enter the demilitarized zone to report on the rescue operation may result in "unpredictable incidents."
"If the U.S. and the South Korean authorities persist in their wrong acts to misuse the DMZ for the inter-Korean confrontation despite our warnings, these will entail unpredictable incidents including the loss of human lives in this area for which the U.S. side will be wholly to blame," North Korean officials said in a press release.
Four ships from the U.S. Navy's 7th Fleet, which were in the area for military exercises, joined the rescue efforts on Monday, following a request from Seoul.
AP and the BBC contributed to this report.