G4S shares have fallen by 11 percent after the outsourcing giant revealed that overall profit margins would be lower than expected in 2013.

G4S brought its trading forecast forward, to reveal that margins would be 0.6 percent down by the end of March, with the likelihood that margins would stay at a low level throughout the rest of the year.

The impact of the Eurozone crisis has reduced profit margins from business, as well as reducing the available work, as public sectors cut back on outsourced contracts alongside public services.

G4S said that turbulent conditions in Europe, along with client non-payment and public service contraction had resulted in poor performance and negative expectations for the year.

The security giant has also seen performance impacted by the lasting effects of the public failure of the Olympic games, with G4S having to pay £88 million in compensation for failing to deliver enough staff.

A statement from G4S detailed: "For all of these reasons, and despite ongoing business improvement plans, the first quarter margin trends are expected to continue for the full year”.

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