POLICE were last night investigating a home-made bomb explosion which injured a 25-year-old man who claimed he was using the device for fishing. Police said the man did not have any other fishing equipment with him. His girlfriend, who was at the scene, was unhurt. The explosion took place in Po Lo Che in Sai Kung at 10 pm. The man was taken to Prince of Wales Hospital with injuries to his abdomen and right hand and was said to be in fair condition.