At least 14 people were injured after a gas explosion sparked a major fire in a shopping district of Kansas City, Missouri.

City Manager Troy Schulte said he did not know of anyone being reported missing and had not heard of any fatalities.

Video footage showed dozens of firefighters battling a massive blaze that appeared to have engulfed an entire city block, with flames burning through the roofs.

Black smoke swirled in the air and debris littered surrounding streets.

A spokesman for University of Kansas Hospital said five people were being treated there. One person was said to be in a critical condition, while two others had serious injuries.

The shopping area includes retail shops, restaurants, apartments and offices.

City officials believe the gas explosion was triggered during construction work in the area.