Do they need U.S visa ?

My parents are visiting us in U.S.They arrived U.S last month.They are B2visa holder,Their visa is six month valid and Mutiple entry.If they like to visit Mexico for a week,Do they still need visa to reentry U.S when they back from Mexico? Thank for your reply .

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• 30天內返回不需要但在I-94期限內 -護照還是要帶上- ♀ (0 bytes) () 04/04/2005 postreply 10:42:49

• 回複：30天內返回不需要但在I-94期限內 -nannan- ♀ (6 bytes) () 04/04/2005 postreply 11:39:55