TORONTO, April 30 (Reuters) – Canada wants to change a bilateral agreement to allow it to turn back thousands of asylum seekers walking across the border but the United States is not cooperating, according to a Canadian official with knowledge of the discussions.

Source: http://feeds.reuters.com/~r/reuters/AfricaNigeriaNews/~3/PvyMqHDz5cM/idAFL1N1S32ZJ