HARBIN, Aug. 3 (Xinhua) -- Two bombs left by the Japanese army 80 years ago were unearthed in northeast China's Heilongjiang Province, local sources said on Wednesday.

The bombs, which weigh 200 kilograms and are 135 centimeters long, were found in a vegetable field in Xiaoxishan Village of Hulin City and cleared by soldiers on Tuesday.

They are believed to have been left by invading Japanese troops during World War II, said Wang Jinlei, head of the Hutou police bureau.

The bombs were the heaviest found in Hulin City in 15 years.

"They were well preserved, with fuses and powder and a potential risk of explosion," he said. Villagers were evacuated after the discovery.

Between 1934 and 1945, the Japanese army built 17 fortresses along the 5,000-kilometer border between China and the Soviet Union. The Hutou fortress in Hulin City is one of them.

According to Wei Chuanliang, curator with the Hutou fortress museum, the Japanese deployed huge cannons to attack the transportation hubs and military bases in the Soviet Union.

He said the bombs could provide more evidence for the study of the history of Japanese invasion 80 years