WASHINGTON-The United States on Tuesday called North Korea's artillery attack on a South Korean island earlier in the day "outrageous," but said there will be no precipitous response. US envoy for North Korea Stephen Bosworth is returning to Washington from Beijing after consultations with South Korean, Japanese and Chinese officials. Officials here are not minimizing the seriousness of the artillery barrage, which came shortly after revelations of new North Korean nuclear activity. But they say the Obama administration intends to move carefully and deliberately in the face of what the White House calls "belligerent action." US envoy for North Korea Stephen Bosworth, who was dispatched to the region earlier this week after Pyongyang revealed an apparent uranium enrichment plant, conferred with senior Chinese officials on the artillery attack. Bosworth, who is due back in Washington on Wednesday, called the attack "aggression" and said the United States and China share the view that such conflict is "very undesirable."