Règle correspondante
Canada
Practice Relating to Rule 67. Inviolability of Parlementaires
Canada’s LOAC Manual (1999) states:
A parlementaire may be accompanied by other personnel agreed upon by the commanders involved …
The adverse party does not have to cease combat. The belligerent may not fire upon the parlementaire, white flag or party. The parlementaire and those who are in his or her party are entitled to complete inviolability, so long as they do nothing to abuse this protection, or to take advantage of their protected position. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 14-1, §§ 4 and 5.
Furthermore, the manual stresses: “During the withdrawal and return to the parlementaire’s own lines, the parlementaire continues to enjoy inviolability and may not be attacked.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 14-1, § 9.
The manual notes: “To fire intentionally upon the white flag carried by a parlementaire is a war crime.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 14-1, § 6.
The manual also states: “The following vessels of an adverse party shall not be attacked: … vessels granted safe conduct by agreement between parties to the conflict (e.g. vessels carrying PWs [prisoners of war] …).” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-9, § 94(c); see also pp. 7-6 and 7-7, § 60(c) (air warfare) and p. 8-6, § 41(c) (naval warfare).
Canada’s LOAC Manual (2001) states in its chapter entitled “Communications and contact between opposing forces”:
2. Parlementaires normally operate under a white flag of truce. A parlementaire may be accompanied by other personnel agreed upon by the commanders involved …
3. There is no obligation upon the adverse party to receive a parlementaire. The adverse party does not have to cease combat. The belligerent may not fire upon the parlementaire, white flag or party. The parlementaire and those who are in his or her party are entitled to complete inviolability, so long as they do nothing to abuse this protection, or to take advantage of their protected position.
4. To fire intentionally upon the white flag carried by a parlementaire is a war crime.
7. After making contact with the adverse party, the parlementaire must obey any orders that a party provides regarding the entry of that party’s lines, and must withdraw if so instructed. During the withdrawal and return to the parlementaire’s own lines, the parlementaire continues to enjoy inviolability and may not be attacked. When ordered to withdraw, the parlementaire must be given a reasonable time in which to do so. Failure to withdraw results in loss of protection and the parlementaire may then be fired upon. If the parlementaire remains within enemy lines after being ordered to withdraw, he loses his inviolability and may be made a PW [prisoner of war]. Detention may occur if the parlementaire has abused the position of parlementaire, for example, by collecting information covertly. It is not an abuse of the position for the parlementaire, however, to report on observations made.
8. Only the parlementaire and an interpreter are entitled to enter enemy lines. The other members of the party must obey orders given by the adverse party. They remain entitled to protection until the parlementaire rejoins them and they return to their own lines …
9. … Any measure that may be taken against the parlementaire or attending members of the party must be reported to the sending belligerent without delay. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 1402.2–4 and 7–9.
In its chapter on targeting, the manual further states: “The following vessels of an adverse party shall not be attacked: … vessels granted safe conduct by agreement between parties to the conflict (e.g., vessels carrying PWs or humanitarian supplies)”. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 449.1.c.
Similarly, in its chapter on air warfare, the manual states: “The following enemy vessels are protected and may not be attacked: … vessels granted safe conduct by agreement between the belligerent parties (for example, vessels transporting PWs or engaged in humanitarian missions)”. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 720.1.c.
Similarly, in its chapter on naval warfare, the manual states: “The following enemy vessels are protected and may not be attacked: … vessels granted safe conduct by agreement between the belligerent parties (e.g., vessels transporting PWs or engaged in humanitarian missions)”. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 828.1.c.