Chief Cabinet Secretary Hirokazu Matsuno told a news conference that the suspect who threw the device at Kishida had been arrested on charges of “obstruction of business by force. ”Matsuno told Reuters that police had been instructed to boost security, and that the government will do what is necessary to ensure security at the upcoming Group of Seven summit in Hiroshima next month. Japan's foreign ministry said after the incident on Saturday, there would be no change to the security plan for a G7 foreign ministers' meeting starting on Sunday in the resort city of Karuizawa