Iran “vigorously” pursued programs to produce nuclear, chemical and biological weapons during the latter part of 2003 and was working to improve delivery systems, a CIA report said on Tuesday. Al Qaeda was also engaged in rudimentary nuclear research, the CIA said, and the network’s stated willingness to launch an unconventional attack was a major concern. The unclassified semi-annual report to Congress on the acquisition of technology relating to weapons of mass destruction from July 1 through Dec. 31, 2003, was posted on the intelligence agency’s Web site www.cia.gov.Full Story