Handbag snatched from car

Just before noon, while waiting for traffic lights in front of shops near Sunway Giza, I heard a loud bang. My first reaction was that someone had knocked into my car. Just as I turned to look, I saw my passenger car window smashed and a hand had reached in to snatch my handbag. They were quick, all I can recall are 2 men on a motorbike. I was too stunned to do anything but sound my horn. I couldn't move as there were cars in front, behind and beside me. If there are any witnesses who were behind me and had noticed the make or registration no. of the motorbike, please respond. I didn't even think of getting down to ask at the time.