North Korea tests underwater nuclear attack drone

North Korea carried out another test of an underwater nuclear attack drone earlier this week, according to a report Friday.

The Haeil-2 drone began its test April 4 in Kajin Port, located in Kumya County, South Hamgyong Province, said the Korean Central News Agency.

It said the drone traveled a simulated distance of 1,000 kilometers (621 miles) in elliptical and "8" patterns, set in the East Sea of Korea, for 71 hours and six minutes.