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San Remo Manual on International Law Applicable to Armed Conflicts at Sea, 12 June 1994
PRECAUTIONS IN ATTACK
SECTION II : PRECAUTIONS IN ATTACK
46. With respect to attacks, the following precautions shall be taken:
(a) those who plan, decide upon or execute an attack must take all feasible measures to gather information which will assist in determining whether or not objects which are not military objectives are present in an area of attack;
(b) in the light of the information available to them, those who plan, decide upon or execute an attack shall do everything feasible to ensure that attacks are limited to military objectives;
(c) they shall furthermore take all feasible precautions in the choice of methods and means in order to avoid or minimize collateral casualties or damage;
(d) an attack shall not be launched if it may be expected to cause collateral casualties or damage which world be excessive in relation to the concrete and direct military advantage anticipated from the attack as a whole; an attack shall be cancelled or suspended as soon as it becomes apparent that the collateral casualties or damage would be excessive.
Section VI of this Part provides additional precautions regarding civil aircraft.