QUETTA, Pakistan, May 3 (Reuters) - A young Afghan fan of Argentine soccer star Lionel Messi has fled his home and gone to Pakistan because his family feared he could be kidnapped after he became an unlikely Internet sensation, the boy's uncle said on Tuesday. Five-year-old Murtaza Ahmedi grabbed world headlines after being photographed in a shirt improvised from a plastic bag in the colours of the Argentine national team bearing Messi's name and number 10 playing number. After pictures of Murtaza went viral on social media, his family feared that after becoming famous worldwide, he could be abducted by kidnappers for ransom. His home is in the central region of Ghazni where security has been fragile and where kidnappings are common.