WASHINGTON, April 14: The United States said on Tuesday it had received "significant amounts of information" on Pakistani scientist Dr A.Q.Khan's illicit activity as reports revealed he had seen three nuclear bombs in North Korea.

The US State Department, commenting on the New York Times report, said Washington worked very closely with Pakistan to dismantle Dr Khan's network after he publicly confessed that he had shared nuclear secrets with Iran, Libya and North Korea.

Washington "has received significant amounts of information from Pakistan about the network, about Mr Khan's activities, about the activities of his associates, about others who were involved", department spokesman Richard Boucher told reporters. Mr Boucher said he could not comment specifically on the report, which had contained US intelligence information. -AFP