日军规定天长节祝捷大会只准日本、台湾和朝鲜人参加。王亚樵更与在沪的大韩民国临时政府合作。4月26日，王在静安寺路(今南京西路)沧州饭店与韩国友人安昌浩商议合作抗日，决定用定时炸弹爆炸会场，定时炸弹由安昌浩负责，而一应经费则由王亚樵负担；投弹人员由临时政府负责物色，王则予以配合。王有胞弟王述樵身材矮胖，留有小胡子，又能说几句日语，像个日本人，便负责与安昌浩联络，王述樵当日便给安送去四万元。安昌浩与王亚樵商定后，即在其寓所霞飞路(今淮海中路)宝康里40号召集韩国志士尹奉吉、安昌杰、金天山等，宣布与中国抗日同志合作；然后商妥方案，务必一举成功。
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