SOUTH Korea deployed a sentry robot capable of detecting and killing intruders along the heavily fortified border with North Korea, officials said overnight.
"Our military has been testing such robots along the border," a defence ministry spokesman said.
Two robots with surveillance, tracking, firing and voice recognition systems were integrated into a single unit, he said, declining to give details.
The robot unit costing 400 million won ($US330,000) was installed last month at a guard post in the central section of the Demilitarized Zone which bisects the peninsula, Yonhap news agency said.
It quoted an unidentified military official as saying the ministry would deploy sentry robots along the world's last Cold War frontier if the test is successful.
The robot uses heat and motion detectors to sense possible threats, and alerts command centres, Yonhap said.
If the command centre operator cannot identify possible intruders through the robot's audio or video communications system, the operator can order it to fire its gun or automatic grenade launcher.
South Korea is also developing highly sophisticated combat robots armed with weapons and sensors that could complement human soldiers on battlefields.
It has a largely conscripted military of 655,000 against Pyongyang's 1.2 million-strong force, but a falling birth rate means Seoul will struggle in the future to maintain troop numbers. 
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