The New Delhi government has ordered all its airports across the country to return the Italian Ambassador Daniele Mancini if he tries to leave the country amid the diplomatic row between the two countries following Rome's refusal to send back its two Marines who were accused of shooting two Indian fishermen.

All the airports in the country are on alert after the Indian Supreme Court ordered the Italian ambassador not to leave India till the two marines - Massimilian Latorre and Salvatore Girone return to India.

The court had permitted the two Italians to go home to participate in the country's election last month.

The Italian ambassador in India has assured the return of the two marines on time.

Office of the Italian President Giorgio Napolitano Friday said that it was trying to resolve the row through a 'friendly agreement' with the New Delhi government.

The marines are accused of shooting two Indian fishermen in Kerala February 2012. The accused said they mistook them for pirates.

Arguing that the case is now the subject of international maritime law, Italy denied returning the two men to India.

Calling Italy's refuse to return the marines as 'unacceptable', Indian Prime Minister Manmohan Singh Wednesday warned the Italian government that "there will be consequences" if Italy further refuses to cooperate.

As the Italy's decision hit hard on the face of the Indian government, Indian opposition parties have been calling upon the Italian government to immediately return the two.

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