[A girl looks on as migrants line up to receive personal hygiene goods distributed by the United Nations High Commissioner for Refugees (UNHCR), outside the main building of the disused Hellenikon airport]The European Union's executive will propose a reform of the bloc's asylum rules on Wednesday, EU sources said, that reflects caution in the face of deep divisions among governments about how to handle the migration crisis. The European Commission last month floated scrapping a rule in the so-called Dublin system that gives responsibility for handling asylum claims to the first EU state a person enters -- a rule that has placed heavy burdens on Greece and Italy.