Watch: Shinzo Abe shooting video has been trending on Twitter and Reddit.
Mr Abe was shot at twice while he was giving a speech in the southern city of Nara on Friday morning.
Security officials at the scene tackled the gunman, and the 41-year-old suspect is now in police custody.
A search of the alleged gunman’s home uncovered what police believe are explosives, local media reported.
Watch: Shinzo Abe Shooting Video
Former Prime Minister Shinzo Abe, the longest-serving leader of modern Japan, was gunned down on Friday.
shooter shot him while campaigning for a parliamentary election, shocking a country wherepolitical violence had become almost unthinkable.
Abe, 67, was pronounced dead around five and a half hours after the shooter opened fire on him from behind as he spoke to members of the public from a drab traffic island in the western city of Nara.
Authorities arrested a 41-year-old man. Japanese media reported that the weapon appeared to be a homemade gun.