Six youths have landed in the police lock-up in the last two months for calling up the emergency number 100 and passing vulgar comments on women police personnel on duty. The women police personnel filed complaints against the youths. Additional commissioner of police (administration) Sanjeev Singhal told DNA that the police have decided to take the matter seriously and stern action would be taken against the pranksters. "So far we have filed six cases and stern action will be tak…