Saw live robbery in sharjah

I saw live robbery in sharjah behind saharah center.. there’s a ground which people cross by walk… it was 11 PM and people were walking in saw two black men one with big machete knife beating one guy it was really shocking to see such thing in sharjah as we assume UAE as safe place. This whole incident was happening just 30 m away from me… how those black guys managed to get that big machete knife and openly robbed a person phone and wallet..