大至明白您要表达意思,正文部分由些许语法和拼写错误,现稍作修改如下:
I'm writing this to draw your attention to those thieves who made all of us suffer a lot. Wh have already called the police and installed monitors in the building. In addition, we highly recommend you keep an eye on your belongings, anytime.
希望对您有帮助:)