Market observers say investors will initially favour traditional safe-haven assets and may be inclined to pick deals that are most relevant to former President Donald Trump's chances of winning the White House after surviving an assassination attempt. Currency trading began at 5am Sydney time, which could give a boost to the dollar, while other haven currencies such as Japan's beleaguered yen, Swiss franc and gold are also expected to shrug off market volatility. Bitcoin prices briefly rose above $60,000 following the attack. Traders will also be looking at futures contracts in the Standard & Poor's 500 index and the U.S. Treasury market, both of which start trading at 6 p.m. New York time; cash trading in U.S. bonds doesn't start until 7 a.m. London time due to a Japanese national holiday.