A teenage girl was grabbed by a man who threw liquid her as she was walking in a Berkshire street.
The 13-year-old was walking in Whittaker Road, Slough, between 1530 and 1600 GMT on Wednesday, when the man grabbed her coat.
The girl managed to break free and was uninjured. Police are now searching for two men seen in a white Transit van.
Officers are trying to identify the liquid, which is not believed to be toxic.
The man is described as about 5ft 4in and slim, casually dressed, wearing jeans and holding an orange carrier bag.