NORFOLK, Va. (WAVY) — A plane returned to Norfolk International Airport (ORF) shortly after taking off on Tuesday because of smoke in the cockpit, officials say. 

The pilot of the United Express ERJ145 declared an emergency at 6:06 p.m., according to a spokesperson with Norfolk Airport Authority, and landed safely back at ORF nine minutes later. 

Passengers got off the plane and the airport fire department boarded to inspect the aircraft. Officials say the smoke had dispersed and firefighters could not determine what caused the smoke. 

The ORF spokesperson says any follow-up investigation into the cause of the smoke would be conducted by United Ground Express.