RJD leader Lalu Prasad's recent visit to Patna Zoo with security men carrying weapons has sparked off a controversy with the authorities ordering an inquiry by a Forest Ranger to investigate the matter. <br/><br/>Forest Ranger Shashibushan Prasad has begun an investigation and would submit the report in a week. <br/><br/>Director of Patna Zoo Abhay Kumar said, Lalu Prasad visited the zoo on Wednesday to offer prayers at a temple inside with his security guards carrying sophisticated weapons, prompting an inquiry. <br/><br/>The guards of the zoo have also been asked to explain why they allowed Prasad's security personnel to enter the zoo with weapons. <br/>