NHK projects Japan's ruling coalition Liberal Democratic Party and its partner Komeito are certain to secure enough seats to maintain its majority in the Upper House.
The coalition will take more than half of the seats up for grabs. NHK expects that parties in favor of amending the Constitution will surpass a threshold for starting the process to propose a change.
Sources say the suspect in the fatal shooting of former Prime Minister Abe Shinzo has told police that the gun used in the attack was designed to discharge six bullets at one time.
Abe was shot on Friday as he was making a campaign speech in the western city of Nara. Police arrested the 41-year-old suspect, Yamagami Tetsuya, an unemployed resident of the city.
The US State Department says Secretary Antony Blinken will travel to Tokyo to offer his condolences on the death of former Japanese Prime Minister Abe Shinzo.
The State Department announced the plan in a statement on Saturday.
The NHK decision desk is projecting that the Liberal Democratic Party's Asahi Kentaro, Komeito's Takeya Toshiko and Yamazoe Taku of the Japanese Communist Party will retain their seats in Tokyo.
Incumbent lawmaker Asahi is expected to win a second term. He is a former beach volleyball Olympian.
The NHK decision desk is projecting that all four incumbents in the Osaka district will retain their seats.
Asada Hitoshi and Takagi Kaori of Japan Innovation Party, the LDP's Matsukawa Rui and Komeito's Ishikawa Hirotaka, all appear headed for a win.
The Liberal Democratic Party's Mihara Junko is projected to retain her seat in the Kanagawa electoral district.
The 57-year-old former actor has served two terms in the Upper House.
People across Japan are casting ballots on Sunday to fill the Diet's Upper House.
Election officials said voter turnout was at 18.79 percent as of 2 p.m.
The suspect in Friday's shooting of former Prime Minister Abe Shinzo reportedly says he went to a campaign venue in the western city of Okayama one day before, but gave up his plan to attack then because the venue was conducting admission procedures.
Abe was fatally shot as he was making a campaign speech in the western city of Nara. Police arrested the 41-year-old suspect, Yamagami Tetsuya, an unemployed resident of the city.
A huge crowd of mourners has gathered at the spot where former Japanese Prime Minister Abe Shinzo was gunned down on Friday.
More than 1,000 people waited in line on Sunday afternoon to lay flowers and offer prayers at the site of the attack, in front of a train station in Nara, western Japan.
NHK has learned that police officers on duty at the venue where former prime minister Abe Shinzo was giving an election campaign speech didn't recognize a suspicious man in the crowd until hearing the first gunshot.
Abe was fatally shot from behind on Friday afternoon during an appearance in the western city of Nara.
The suspect in the shooting of former Prime Minister Abe Shinzo reportedly told police that he initially intended to kill Abe by using explosives before deciding to use a gun.
Abe was fatally shot on Friday as he was making a campaign speech in the western city of Nara.
The body of former Prime Minister Abe Shinzo has returned to his home in Tokyo. Abe was shot to death on Friday while giving a speech in the western city of Nara.
The vehicle carrying Abe's body arrived at his home in the Shibuya district around 1:30 p.m. on Saturday.
Japanese police say former Prime Minister Abe Shinzo died from loss of blood after a bullet damaged an artery under his collarbone.
Police carried out an autopsy on Abe's body through early Saturday.
US President Joe Biden has called Japan's Prime Minister Kishida Fumio and offered condolences over the death of former Prime Minister Abe Shinzo.
The two leaders talked over the phone for about 10 minutes from 8 a.m. on Saturday, Japan time.