The report by Alberto Nisman, who has already accused senior Iranian officials of planning and financing the 1994 bombing and Hezbollah of carrying it out, points to the resistance among some here to a recent thaw in relations between Argentina and Iran. The two nations agreed in January to establish a joint commission to investigate the attack, which has never been solved.

In his report, Mr. Nisman contended that the 1994 bombing was not an isolated event. “It has to be investigated as a segment in a larger sequence,” he said in a report summary, pointing to parallels with the case of two Guyanese men convicted in 2010 of conspiring to attack Kennedy International Airport in New York.

In that case, a former Guyanese government official, Abdul Kadir, opened himself to a claim by prosecutors in New York that he secretly worked for years as a spy for Iran when he said during cross-examination that he had drafted regular reports to Iran’s ambassador in Venezuela on plans to infiltrate Guyana’s military and police. The plot to attack the airport did not advance beyond the conceptual stage.

Mr. Nisman, who has investigated the bombing since 2005, suggested that “criminal plans” by Iran could be under development in Latin America, including Brazil, Chile, Colombia, Guyana, Paraguay, Suriname, Trinidad and Tobago and Uruguay.

Still, he did not provide concrete evidence as to specific terrorist plots in any of those countries. Mr. Nisman’s report also mentioned the potential development in parts of Latin America by Iran of sleeper cells.

Iran has not handed over any officials wanted here in connection to the bombing.