Bollywood actor Preity Zinta has submitted four photographs to Mumbai police showing bruises on her hand to back her claim of criminal assault against her ex-boyfriend Ness Wadia. br br "These four photographs, which show bruises on Zinta's hand, were received by us today. We are examining the photographs, which will be crucial pieces of evidence in the case," said a police officer involved in the probe.br br Meanwhile, the Wadia group today wrote to Marine Drive police giving details of the witnesses whose statements they want to be recorded in connection with the case.