The Yonhap news agency provided the same information, citing a Foreign Ministry official in Seoul.
South Korea's Yonhap news agency, citing unnamed Foreign Ministry officials, says the group were flown back to Pyongyang on Tuesday.
He also received a briefing on the Yeosu World Expo and met the President of Yonhap news agency, Park Jung-chan.
South Korea's Yonhap news agency reported the drills will take place Monday or Tuesday in the Yellow Sea off the island.
On Wednesday, South Korea's Yonhap news agency reported that five buildings were directly hit and 22 were damaged during the attack.
CNN: Koreas on 'brink of war' because of Seoul, Pyongyang says
The Seoul Central District Court sentenced Hwang Woo-suk, 56, to a two-year prison term, suspended for three years, the Yonhap news agency reported.
The missiles were apparently Scud-type, estimated to have a range of about 500 kilometers (310 miles), according to South Korea's Yonhap news agency.
More than 3, 000 riot police moved in to disperse protesters at the Yoosung Enterprise factory in Asan, south of Seoul, Korea's Yonhap news agency said.
Standard Chartered told Korea's Yonhap news agency that the local auditor, Samil Accounting, had failed to explain exactly how the insolvency of SK had come about.
"We have given permission for the visit and can even discuss the shipment of products at the industrial complex, " Yonhap news agency quoted the committee as saying.
South Korea's central bank followed the lead taken by other central banks a day earlier, slashing its key interest rate by a quarter percent, the Yonhap news agency reported.
South Korea's Yonhap news agency reported that the corporation hoped to exploit deposits of iron ore, gold and copper in other parts of the Tanzania to help fund its project.
The two sides had decided to reschedule the meeting "to maintain a firm defense readiness amid the current security situation, " South Korea's Yonhap news agency quoted a Joint Chiefs of Staff official as saying.
"Amid this kind of atmosphere, our stance is that it will be difficult to hold a productive discussion and Yun decided not to visit Japan this time, " an unidentified foreign ministry official told Yonhap news agency.
On Thursday, a spokesman for the South Korean Defence Ministry, Kim Min-seok, said Pyongyang had been observed carrying out "various drills involving the army, navy and air force, " and that further exercises were being prepared, the Yonhap news agency reports.
The South Korean news agency Yonhap said that two warships equipped with Aegis defence systems would monitor the situation.
South Korean Defense Minister Kim Kwan-jin told a parliamentary committee in Seoul that the activity signaled an imminent test firing or military drill, according to the semi-official South Korean news agency Yonhap.
South Korean Defense Minister Kim Kwan-jin told a parliamentary committee in Seoul that the North has moved a medium-range missile to its East coast for an imminent test firing or military drill, according to the semi-official South Korean news agency Yonhap.
The seizure of the boat was first reported by South Korea's news agency, Yonhap.
The South Korean foreign ministry criticized Tamogami's commentary in a statement published by Yonhap, the South Korean news agency.
The launch is believed to be slated for sometime between April 4 to 8, according to Yonhap, South Korea's state-sponsored news agency.
CNN: N. Korea defends right to 'explore space' amid missile claim
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