ABUJA, Nigeria -- Authorities say two fuel tankers have exploded in Nigeria's capital of Abuja, sending plumes of smoke over the city and panicked commuters rushing away.

Witnesses described hearing at least two blasts Wednesday afternoon. A spokesman for Nigeria's National Emergency Management Agency says the two tankers exploded near or at two different gas stations. Spokesman Yushau Shuaib says there have been no reported injuries from the blasts.

A local police spokesman says an investigation is underway.

The blasts come as Nigeria remains under attack from a radical Muslim sect operating in the country's northeast.

The Boko Haram sect previously bombed targets in Abuja and a warning from the U.S. Embassy recently said luxury hotels there were potential targets.