Ballantine's Championship: Dustin Johnson and Zach Johnson withdraw
Dustin Johnson and Zach Johnson have pulled out of the Ballantine's Championship in South Korea this week.
Last Updated: 23/04/13 7:39am
"They have reached this decision following perceived unrest on the Korean peninsula," the sponsors of the European Tour event said in a statement.
There has been hostility in the region for weeks because of United Nations sanctions imposed on North Korea for a nuclear test.
And on Sunday, a South Korean news agency reported that the North had moved short-range missile launchers to its east coast, apparently indicating it was pushing ahead with preparations for a test launch.
World No 7 Louis Oosthuizen of South Africa will be the highest-ranked player at the event which is due to start on Thursday.
Former US PGA champion Yang Yong-eun of South Korea, 1999 Open winner Paul Lawrie and former European Ryder Cup player Paul Casey are also entered in the tournament.