Italian Foreign Minister Giulio Terzi today warned of "considerable differences" with India over the alleged killing of two Indian fishermen mistaken for pirates by Italian soldiers on an oil tanker.

"There are currently considerable differences of a legal character. Up to now I have not seen the co-operation between India and Italy that would be desirable and would allow a quick resolution," Terzi said.

Italy says the men have immunity from Indian law as the tanker, the Enrica Lexie, was flying with an Italian flag in international waters as it sailed from Singapore to Egypt when the shooting occurred on Wednesday.

The two soldiers, who were deployed on the ship under a new law passed in Italy last year to protect against the growing threat from pirates in the Indian Ocean, were due before an Indian magistrate today.

They were escorted off the vessel and arrested yesterday.

Firing on Indian: 'Guilty cannot be pardoned'

PTI | Chennai : The killing of two Indian fishermen off the Kerala coast in firing allegedly by two Italian marines on board an oil tanker is an 'unpardonable crime' and the guilty would be punished, Shipping Minister G K Vasan said here today.

"As I have already said it is condemnable. They (Kerala police) are looking into it as a suspicious incident. Our waterfront is not infested by pirates.So it is an unpardonable crime to shoot innocent fishermen thinking they are pirates. There is no second opinion on whether to punish them for the act," he told reporters on the sidelines of a function here.

Asked if the marines would be tried under Indian law, he said, "One thing I am very clear. Punishment should be given to the guilty. We have lost two precious lives of fishermen, which cannot be pardoned, which cannot be taken for granted."

Assuring that steps would be taken to prevent recurrence of such attacks, he said "The Mercantile Marine Department under the Shipping Ministry, along with Defence, Law and External Affairs ministries are investigating the issue and the guilty will be punished...Centre will give full protection to them."

The two fishermen, Ajesh Binki (25) and Jalastein (45) were killed on February 15 off Kollam coast near Kerala when armed guards of 'Enrica Lexie' fired at their boat.

Preliminary assessment of marine authorities is that the guards might have fired at the boat, mistaking it for a pirate vessel.