TOKYO, March 14 (Xinhua) -- Tokyo stocks opened lower Wednesday following losses overnight on Wall Street as U.S. President Donald Trump fired Secretary of State Rex Tillerson.

As of 9:15 a.m., the 225-issue Nikkei Stock Average dropped 151.78 points, or 0.69 percent, from Tuesday to 21,816.32.

The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, dropped 9.57 points, or 0.55 percent, at 1,741.46.

Marine transportation, machinery and mining-linked issues comprised those that declined the most in the opening minutes after the morning bell.