TOKYO, June 1 (Xinhua) -- Tokyo stocks gained ground Friday morning as a comparatively weak yen against the U.S. dollar lifted the market mood and gave exporter issues a boost, although concerns the United States will impose tariffs on steel and aluminum imports from the EU, Canada and Mexico still remained.

The 225-issue Nikkei Stock Average added 71.68 points, or 0.32 percent, from Thursday to 22,273.50.

The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 8.03 points, or 0.46 percent, at 1,755.48.

Transportation equipment, bank and pulp and paper-linked issues comprised those that gained the most by the morning break. Enditem