US equity futures turned lower ahead of Tuesday's opening bell as traders digested earnings results from Johnson & Johnson (JNJ) and Bank of America (BAC).

Dow Jones Industrial Average futures, S&P 500 futures, and Nasdaq futures were all down about 0.4%.

Johnson & Johnson and Bank of America both reported higher Q1 earnings and revenue.

Oil prices were lower, with front month global benchmark North Sea Brent crude down 0.8% at $64.36 per barrel and US West Texas Intermediate crude 0.8% lower at $61.05 per barrel.

The Empire State Manufacturing index, released at 8:30 am ET, came in at minus 8.1 in April following a minus 20.0 in March, compared with estimates compiled by Bloomberg for minus 13.5. Import prices fell 0.1% in March compared with estimates for a no change, while export prices were flat for the month, in line with expectations.

In other world markets, Japan's Nikkei closed 0.8% higher, Hong Kong's Hang Seng ended 0.2% higher, and China's Shanghai Composite finished 0.2% higher. Meanwhile, UK's FTSE 100 rose 0.8%, and Germany's DAX index gained 0.5% in Europe's early afternoon session.

In equities, shares of Bank of America were 1.9% higher pre-bell. Ericsson (ERIC) shares increased 6% after the company posted higher Q1 earnings and sales.

On the losing side, Boeing (BA) shares fell 3%, a day after the US Federal Aviation Administration said it will investigate a Boeing 737-900 engine issue on a Delta Air Lines (DAL) flight.