Be careful in Jakarta

Today i already read email from my friend.
She tell me in that email that there is a crime modus. A few of people with car, they pick one person and then they ask big amount of money to their parents. In that email, that amount about Rp. 10 millions. And after that parents give the money, they will give their child and before that, they hit him and throw him to the road.
That so cruel .. Btw, that criminal interested to person who walk alone.
i dont know, how can they use this way to got the money. And it happen in jakarta... Jakarta again....
owwwwkkkk i hate that!!!!
I wish that the government show that jakarta is very comfort for us not like today.
When i look the other country like German, Singapore, or part of Indonesia (Bali). If we walk alone and fell so comfort and dont care that walk alone in the night.
Ow ya, last month, i heard from my sister, that she ride a bus with her friend, and a few of man do their action to got gold necklace of my sister's friend. And they use knife to got that necklace. He told to my sister's friend, " give your necklace, or i will kill u with this knife (that knife on the neck) or he will push her out of bus (that bus still run fast)."
After that, she give the necklace, with bloody neck!
(Dont use jewelry, handphone, dont show ur wallet with large amount of money, dont talk about salary, money, in the bus or the other vehicle which not own vehicle)
So guys be careful everywhere...