TOKYO, June 25 (Xinhua) -- Tokyo stocks lost ground Monday morning following reports that Washington will finish its investigation into automobiles earlier than expected.

The market mood was also dented by heightening global trade tensions after U.S. President Donald Trump threatened to slap more tariffs on all cars imported from the European Union.

The 225-issue Nikkei Stock Average dropped 82.77 points, or 0.37 percent, from Friday to 22,434.06.

The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, dropped 7.7 points, or 0.44 percent, to 1,737.13.

Land transportation, metal product and air transportation issues comprised those that declined the most by the morning break.