TRIPOLI, Libya — In the final weeks of Col. Muammar el-Qaddafi’s battle with Libyan rebels, Chinese state companies offered to sell his government large stockpiles of weapons and ammunition in apparent violation of United Nations sanctions, officials of Libya’s transitional government said Sunday. They cited Qaddafi government documents found by a Canadian journalist, which the officials said were authentic.

The documents, including a memo from Libyan security officials detailing a shopping trip to Beijing on July 16, appear to show that state-controlled Chinese arms companies offered to sell $200 million worth of rocket launchers, antitank missiles, portable surface-to-air missiles designed to bring down aircraft, and other weapons and munitions. The documents, in Arabic, were posted on Sunday on the Web site of The Globe and Mail, a Toronto newspaper.

The Chinese companies apparently suggested that the arms be delivered through third countries like Algeria or South Africa. Like China, those countries opposed the United Nations authorization of NATO military action against Qaddafi forces in Libya, but said they supported the arms embargo imposed by an earlier United Nations resolution.

A rebel military spokesman, Abdulrahman Busin, said in an interview on Sunday that the transitional government would seek accountability through appropriate international channels. Mr. Busin said that any country that had violated the sanctions would have poor prospects for business and other dealings with Libya, an oil-rich country.

“We have hard evidence of deals going on between China and Qaddafi, and we have all the documents to prove it,” he said, adding that the rebels have other evidence, including documents and weapons found on the battlefield, showing that arms were supplied illegally to Colonel Qaddafi’s forces by numerous other governments or companies. “I can think of at least 10 off the top of my head,” he said.