The crash took place in the city of Pocheon, some 40 km (25 miles) north of South Korea’s capital of Seoul, late on Sunday, Yonhap news agency reported.
The car, with four civilians on board reportedly butted the rear of a US military vehicle on its way to a military base in Cheorwon, Gangwon Province.
The four victims, all in their 50s, were taken to hospital in the aftermath of the incident but succumbed to their injuries later in the night despite the efforts to resuscitate them.
Photos from the scene show the front of the passenger car badly mangled and debris scattered on the road.
The US personnel that were returning from a drill at the time of the incident have emerged relatively unscathed from the crash, which caused damage to the caterpillar tracks of the armoured vehicle. One soldier was taken to hospital with a minor injury.
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