By Mathilde Grandjean & Benedict Tetzlaff-Deas Police have launched anurgent investigation after a young man was attacked by a stranger on the street. The victim, a man in his 20s, was left with injuries to his head and wrist in after assault on the evening of April 21 in Newbury, Berkshire. He also had his phone stolen by his attacker, who police said was not known to him. A spokesman for Thames Valley Police said: “Thames Valley Police is appealing for witnesses to an incident of grievous bodily harm in Newbury. Between 9pm and 10pm last Sunday (April 21), the victim, a man aged in his twent…