never leave your valuable items in the car coz crime rates are increasing in Qatar
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Moreover, "crimsonflaw" most of the guys do offer their help or services to load your shopping items in your car so you don't have to get frightened from them. Also, you're in a Mall's Car parking so definitely no person would be dumb enough trying to rob you as there are people on foot & also in car searching for parking.
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So don't worry in such dense spots & be COOOOOL man