A 16-year-old boy from Ulhasnagar was slashed on the stomach by a 12-year-old boy after the former objected to the water balloons being thrown at him some minutes earlier. Some passers-by took the boy to hospital and informed the police.

The 12-year-old boy and his friends were making a nuisance of themselves at Hanuman Nagar in Ulhasnagar on Thursday. They had been catching people unawares since the morning and people had become fed up of the nuisance.