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Tokyo stocks opened 1.17 percent higher on Wednesday, buoyed by a weaker yen and a solid performance on Wall Street, where shares briefly fell on a bogus Twitter message about blasts in the White House.
The Nikkei 225 index at the Tokyo Stock Exchange was up 157.63 points to 13,687.28 at the start.
"US stocks' resiliency, as well as the stronger dollar should help the Nikkei to a fresh year high," said SMBC Nikko Securities general manager of equities Hiroichi Nishi.
The Dow Jones Industrial Average finished up 1.05 percent at 14,719.46 on Tuesday, helped by good earnings results from DuPont, Travelers and other firms.
The market spent most of the day in positive territory, save for a brief plunge after a bogus tweet from a hacked Associated Press account said there had been two explosions at the White House and President Barack Obama had been injured.
The AP almost immediately announced it had been hacked and the message was false.
The dollar bought 99.67 yen in Tokyo early Wednesday, up from 99.48 yen in New York and 98.81 yen in Tokyo Tuesday afternoon.
The euro fetched $1.2996 and 129.48 yen in Tokyo on Wednesday compared with $1.2997 and 129.30 yen in US trade.
-- Dow Jones Newswires contributed to this article --