The North Korean soldier was spotted moving towards South Korea, and then crossed over a military demarcation line separating the two sides, the South's Joint Chiefs of Staff said in a statement.
The railroad could provide valuable link to the rest of the world by making it faster to ship exports to China and Europe.
The US ceases provocative flights that could derail the diplomatic track with North Korea.
"Prison Inside Me" facility hosts mostly workers and students willing to spend 24 hours in solitary confinement to escape the country's infamously demanding work culture.
The announcement by the South Korean technology giant came weeks after the firm and a group representing ailing Samsung workers agreed to accept compensation terms and end a highly-publicised standoff that went on for more than a decade.
Pyongyang's state media reports that North Korean leader Kim Jong-un supervised the testing of the new weapon in a move that could heighten tensions over denuclearisation talks.
The Center for Strategic and International Studies in Washington says they have found at least 13 missile operating bases that were not declared by Pyongyang. The report could be a problem for US President Trump's foreign policy towards the DPRK.
A no-fly zone has come into effect along the heavily fortified border between North and South Korea, despite reservations by Seoul's strongest ally, the United States.
In its report, the US-based Human Rights Watch drew on interviews with more than 50 North Korean escapees to chronicle gruesome details of rape and other abuses perpetrated by security officers such as border guards, but also civilian officials.
South and North Korea — which are technically still at war — agreed to take measures to ease military tensions on their border at a meeting in Pyongyang last month between President Moon Jae-in and Kim Jong-un.
North and South Korea agreed to begin reconnecting rail and road links in high-level talks in the Korean demilitarised zone which were aimed at finding ways to carry out peace agreements between the two countries.
IPCC says limiting global warming to 1.5 Celsius above pre-industrial levels could reduce the number of people exposed to climate risks and poverty by up to several hundred million by 2050. But can poorer nations afford it?
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