The number of cyber acttaks at companies and government offices in Japan has increased since March. (Photo: VNA)

An official at the National Center of Incident readiness and Strategy for Cybersecurity said Japan is likely being targeted as the host of the G7 summit, adding the agency has warned relevant organizations to stay alert.

The summit will be held in Hiroshima between May 19 and 21, bringing together the leaders of Britain, Canada, France, Germany, Italy, Japan, and the US, plus the European Union.