A group of Chinese hackers has launched organized cyber-attacks on dozens of official Web sites in Japan and Taiwan in response to a Japanese attack on a Chinese site last month, the Hong Kong edition of China's official newspaper reported Friday.

The newspaper Wen Wei Po said groups organized 1,900 hackers to launch a massive attack on more than 200 official Web sites in Japan and Taiwan on Monday. The attack was scheduled to continue for a week, it said.

The daily said the hackers were divided into five groups, each responsible for different tasks. The groups are believed to have been organized by the China Federation of Defending the Diaoyu Islands.

The paper said the sabotage was in retaliation for a Japan-based attack on the Web site of the China Federation of Defending Diaoyu Islands on July 25 in which a hacker wrote "the Uotsuri Island belongs to Japan" on the site, the report said. Uotsuri is the largest of the islands, known in Japan as the Senkaku Islands.