Baseball bat-wielding gangs of children are mugging mothers and nannies on the school run in the latest crime wave to hit San Francisco.

Last week Noe Valley, also known as “stroller valley” because of the growing population of young families, endured 11 phone robberies that are believed to have been carried out by the same gang who are targeting women picking up children from school.

One woman was reportedly hit with a baseball bat, while another was punched in the face, before the offender ran to a getaway car and drove off.

On Thursday the police had arrested one minor in connection with the 11 robberies and were searching for the others.