The US Federal Reserve discussed whether recession lurked around the corner and expressed concerns global trade tensions could hit an economy that by most measures looked strong, minutes of its last policy meeting on June 12-13 showed.
The minutes described a meeting in which the Fed raised interest rates for the second time this year.
They also suggested that policymakers might soon signal the Fed's rate-hiking cycle was advanced enough that policy was no longer boosting or constraining the economy.
The minutes overall gave the impression of a central bank impressed by the US economy's strength and confident in its plans to continue raising rates, but also concerned with what could push the economy off its upward course.
"Most (Fed policymakers) noted that uncertainty and risks associated with trade policy had intensified and were concerned that such uncertainty and risks eventually could have negative effects," according to the minutes.
Many of the Fed's contacts across the economy said they were worried a recent increase in tariffs levied by the US and its trading partners was weighing on investment, according to the minutes.
Fed policymakers also had a wide-ranging discussion on whether the recently slim spread between short and long-term interest rates might be a sign of an impending recession.
"A number of participants thought it would be important to continue to monitor the slope of the yield curve," according to the minutes.
At the meeting, Fed policymakers generally agreed that recent economic data showed a strong economy that was evolving in line with their expectations.
However, they also discussed a number of global factors potentially weighing on the economy or its outlook, including "political and economic developments in Europe and some emerging market economies".