At least 11 coaches of the Lokmanya Tilak-Lucknow Garibrath Express train derailed on Sunday near Unnao in Uttar Pradesh, officials said.

"Eleven coaches of the Garibrath Express derailed near Unnao around 1.45 p.m.," Railway Ministry spokesperson Anil Saxena told IANS.

According to the official, the engine and first two coaches remained unaffected but the 11 coaches behind them derailed.

No passenger was injured in the accident as the train was running very slow, he said.

Railway Minister Suresh Prabhu has ordered a probe.