Nuclear blast testing resumed on Tuesday after a six-year hiatus, according to a statement from the US National Nuclear Security Administration.
The US National Institute of Standards and Technology (NNSA) announced in a statement that the three test sites in Colorado, Nevada and New Mexico had resumed “in the best possible condition.”
The US test site in Colorado had been operating at low power for three days, according the NNSA.
The site was shut down following a failed test in February.
The Nevada test site had been shut down for six months after the failed test, the NIA said.
The New Mexico site had recently been closed for six years, but had resumed tests since February, according NNSA data.
The nuclear explosion at the Westinghouse Electric power plant in New Mexico in March 2014 caused an earthquake and radiation release, but the explosion itself did not cause a nuclear disaster.
The blast also caused a large amount of radioactive fallout to be released into the atmosphere.
The explosion occurred at about 9:30am local time (17:30 GMT) on March 14.
The accident has been the subject of a massive investigation by US authorities, with the US Nuclear Regulatory Commission (NRC) and the US Department of Energy (DOE) investigating the incident.