The annual event, which takes place on Thursday and Friday, draws leaders from some of the world's richest nations, including US President Barack Obama and German Chancellor Angela Merkel.
Host Japan said it is taking no chances in the wake of the Paris and Brussels terror attacks, and Fukushima's operator said Tuesday that work at the crippled nuclear plant would be suspended during the talks.
Up to 70,000 police are being deployed before the two-day meeting of the club of rich nations, with about one-third of the officers headed to Ise-Shima, an area between Tokyo and Osaka that is hosting the event.
Dustbins have also been removed or sealed and use of coin-operated lockers blocked at train and subway stations in the capital and areas around the venue site.
Electronic message boards in train stations are warning passengers of the elevated risks and advising them to keep watch for suspicious activity.
Authorities said they will be keeping a close eye on so-called "soft targets" such as theatres and stadiums.
There have been few public protests so far in Japan unlike some previous G7 gatherings.
The company said the measure was not taken over fears of an attack at the plant itself, which is hundreds of kilometres away from both Tokyo and the G7 venue, but rather to "minimise the risk of incidents" that could divert authorities' attention.
"The summit is happening when there is a very serious threat of terrorism internationally," National Police Agency chief Masahito Kanetaka said yesterday.
The March Brussels airport and metro attacks which killed 32 people are believed to be the work of jihadists closely linked to the cell which carried out the November Paris massacres in which 130 people died.
Japan is unused to incidents of international terrorism and is seen as a low-risk target "in normal times", said security expert Shiro Kawamoto.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
