A workshop to explore ways of restricting small firearms will be held Sept. 7 to 9 in Tokyo, Foreign Ministry officials said Friday.

Experts on the issue from 21 countries, including the United States, China and Russia, and about 30 officials from international organizations, including the United Nations, will participate in the meeting, the officials said.

Small firearms, including handguns, are used in civil wars but they are not regulated under international restrictions, they said. A U.N. working group is preparing to issue a report on restricting such arms by next summer, according to the officials.