On investigation the officer discovered that sports clothing had been transferred from the back of the lorry to the other vehicle, without the driver realising.
CRIME: Driver's terror as yobs 'fire' at car in Sheffield with young daughters insideThe driver had parked up in Doncaster having travelled from Turkey.
POLICE: Four arrested in money laundering probe in Sheffield and RotherhamThose involved in the raid fled and a police search is now under way.
A South Yorkshire Police spokesman said: "We have had an increase in freight crime recently - teams of criminals often stealing entire loads from lorries as they are parked overnight. As a result we have been paying more attention to these areas.
"Earlier this morning, one of our eagle eyed officers noticed a vehicle backed up close to a lorry in Doncaster. The rear doors on both vehicles were open.
"When the officer got out to have a closer look, it was clear that he had disturbed someone emptying boxes of clothing from a Turkish registered lorry into their vehicle.
"In terms of value, they had managed to move £113,000 worth of sports clothing from the Turkish lorry into their own."
He added: "The vehicle that the criminals were using was found to be a clone as well.
"It appears that the criminals were also fairly eagle eyed as they managed to exit stage left without being seen by anyone.
"The cloned vehicle has been recovered so that it can be identified and scenes of crime can look at it with a view to working out who was responsible.
"£113,000 worth of clothing was reloaded back into the lorry it was stolen from, and the happy driver allowed on his way."
Anyone with information should call South Yorkshire Police on 101.