A day after thousands hurled stones and bottles at Tokyo's consulate in Shanghai, more than 30,000 demonstrators gathered on Sunday in groups outside the Japanese supermarket Jusco in Shenzhen, said Chiharu Tsuruoka, spokesman for the Japanese consulate in Guangdong province, where Shenzhen is located.
"There were five groups today. The first group of 1000 arrived at Jusco supermarket at 10:30am (0230 GMT)," said Tsuruoka.
"The second one with 10,000 people passed by at 11am. A third one with 10,000 people gathered at noon. The fourth group had 500 people at 12:30pm. The fifth one was at 2pm with 10,000 people."
The groups of protesters marched from Jusco down major thoroughfares in Shenzhen, a boomtown near Hong Kong, he said.
Thousands of anti-Japan protesters on Sunday also marched through Shenyang, a city in the northeast that was the capital of Japanese-occupied Manchuria, Japan's Kyodo news agency quoted officials at the Japanese Embassy in Beijing as saying.
Factory workers demonstrate
About 2000 employees of a Japanese factory in southern China's Guangdong province on Saturday turned demands for better working conditions into an anti-Japan demonstration, a
Japanese diplomat said on Sunday.
"They originally requested better working conditions, but yesterday (Saturday) that turned into an anti-Japanese activity," said the Japanese consulate's Tsuruoka.
Some Japanese nationals were
injured in the demonstrations
"At the peak, there were 2000 people protesting. Then the police came and broke it up," he said.
Tsuruoka declined to identify the company, but a spokesman for Tokyo's Taiyo Yuden Co, which makes electronic parts, confirmed a protest by 2000 people had occurred.
Other cities calm
Shanghai was quiet on Sunday. In Beijing, hundreds of paramilitary police guarded the ambassador's residence or waited on buses to take up positions for the second straight day.
Protesters last weekend threw stones and bottles at the compound, but there have been no repeat protests in the capital this weekend.
Chinese are protesting against textbooks they see as whitewashing Japan's wartime past and against Tokyo's bid for a permanent seat on the UN Security Council.
Japanese minister's visit
Meanwhile, Japanese Foreign Minister Nobutaka Machimura headed for China on Sunday to try to heal relations between the two countries.
Relations between the two Asian powerhouses are at their worst in decades, and China's official Xinhua news agency put the number of protesters in Shanghai at 20,000.
"It was a result of Japan's wrong attitudes and actions on a series of issues concerning China"
Shanghai municipal government spokeswoman
"It was a result of Japan's wrong attitudes and actions on a series of issues concerning China," Xinhua quoted Shanghai municipal government spokeswoman Jiao Yang as saying.
"Dissatisfied with Japan's wrong attitudes and actions on a series of issues such as its history of aggression, the students and citizens spontaneously took to the streets to demonstrate and protest, expressing their discontent with the right-wing forces in Japan on violating the Sino-Japanese relations."
Some protesters held posters carrying messages such as "Face Up to History" and "The anti-Japan war is not over yet."
Two Japanese were injured when they were surrounded by a group in Shanghai, where thousands of Japanese firms and about 34,000 Japanese expatriates are located, Japanese media reported.
Jiao repeated the call for people to "remain calm and rational, express their aspirations in a lawful and orderly manner, and turn their patriotism into an impetus in their work and study but not to join any unapproved activities".
Local media said some protesters had been detained for threatening public order.