[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/WORLD/asiapcf/05/29/nkorea.missile/art.tank.afp.gi.jpg caption="South Korean soldiers ride in armored vehicles during a drill Friday in the border city of Paju."]
U.S. satellite imagery has spotted "vehicle activity" at a North Korean ballistic missile site, two Defense Department officials said Friday.
This activity is similar to that before a long-range missile launch by North Korea earlier this year. It comes amid growing world concern over North Korea's latest nuclear test and test-firings of short-range missiles.
Officials said the imagery shows vehicles used to transport Taepodong 2 missiles were spotted, but no missile parts were seen. The Taepodong 2 missile is a long-range missile that North Korea tested this year.
North Korea test-fired a short-range missile Friday off the country's east coast, a South Korean military source said. It would be the sixth such missile test since the country conducted a nuclear test Monday.
Also Friday, North Korea upbraided the U.N. Security Council for slamming its nuclear test, calling the members of the body "hypocrites" and warning of "stronger self-defense countermeasures" as the world body considers more sanctions against the country.
"There is a limit to our patience," the Foreign Ministry said in a combative statement.
North Korea blasted the Security Council's condemnations of the nuclear test on Monday and the launch in April of what North Korea called a satellite but other countries called a long-range missile.
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