SINGAPORE Singapore 's economy rose faster than expected in the first quarter year-on-year, official data showed on Thursday, pushed by stronger global demand as businesses rushed to beat the imposition of higher U.S. tariffs . The government, however, warned that downside risks remained as a full-blown trade war between the United States and China could still reignite after the end of a 90-day pause. Singapore's trade-oriented economy expanded by 3.9 percent in the three months to March from