The Hongkou Park Incident was a bombing attack on military and colonial personnel of the Empire of Japan at 11:40 am on April 29, 1932.

As a result of the attack, Japanese and French police began interrogating Koreans in the cities, and members of the KPG went into hiding.

The attack earned the KPG the respect of Chinese leader Chiang Kai-shek, who began sheltering and funding them.

It was led by Kim Ku,[4][5] a significant Korean independence activist who is now held in high esteem in South Korea.

He initially sought to advocate for Korean independence through encouraging education and activism, but became disillusioned after continued Japanese suppression.

[8] Japanese colonial and military officials went onto the stage, including Yoshinori Shirakawa, Kenkichi Ueda, Kichisaburō Nomura, and Tomono Mori.

[7] The Illustrated London News reported that:The Japanese National Anthem was being played, when a youth was seen to step forward and place a cylinder on the front of the dais[a] and then dart backwards.

"[10]Kawabata and Mamoru Shigemitsu fell to the floor in pain, and Shirakawa clutched his face, which was then streaming with blood.

[8] The following casualties occurred as a result of the attack: Yun dropped a second improvized bomb[b] nearby with the intent to kill himself.

The crowd reportedly mobbed and attempted to lynch Yun, but the military police pulled him away, bruised and bleeding.

A Chinese person managed to escape the park and sought refuge in the house of W. S. Hibbard, an American park-keeper.

Kim Ku and three others hid at the house of American Presbyterian missionary George Ashmore Fitch, who was sympathetic to the Korean and Chinese resistance against Japan.

[16] A day later, it was reported that Yun was believed to be connected with a Korean organization called the South China Young Men's Association.

[8] On May 2, the North China Daily News reported that the Japanese military had declared martial law in the Wusong area of Shanghai, and that officers were conducting random searches throughout the city.

[c] It also reported that over ten raids by the French and Japanese police, nineteen other Koreans and a Chinese "coolie" had been arrested.

[17] To avoid putting other Koreans at risk, Kim Ku sent out public statements to newspapers in Shanghai claiming responsibility for the attack.

Some of the reported information was incorrect; the Sydney Morning Herald published an article on 30 April that claimed Yun threw a hand grenade and was beaten to death by the crowd.