Tokyo stocks tumbled Thursday amid fears of a global economic downturn due to growing U.S.-China trade tensions, with the benchmark Nikkei index ending at its lowest level in nearly seven months.

The 225-issue Nikkei average ended down 822.45 points, or 3.72 percent, from Wednesday at 21,268.73.

The broader Topix index of all first section issues on the Tokyo Stock Exchange finished 51.15 points, or 3.1 percent, lower at 1,600.92.