John Williams, president of the Federal Reserve Bank of San Francisco, speaks during an interview with Reuters in San Francisco, California December 18, 2015. REUTERS/Stephen Lam

SINGAPORE (Reuters) - San Francisco Federal Reserve President John Williams said on Tuesday there is some upside risk that inflation could hit the Fed’s target sooner, but more data is needed to make a convincing assessment.

Williams was answering a question at an event hosted by the National University of Singapore.

In a speech earlier, he said recent data reinforce his expectation that inflation is on track to move back to 2 percent over the next two years.