One person suffered injuries when officials blasted an unauthorized four-floor structure constructed inside the Malkapur lake using explosives here on Thursday.

Such was the impact of the blast that one home guard Gopal suffered injuries when debris from the structure hit them on being blasted. They were immediately shifted to local hospital.

The incident occurred when officials identified a four-floor structure, which was constructed inside the Malkapur lake in Madhira village under Kondapur mandal. A team of officials from revenue and irrigation departments visited the location on Thursday. Since vehicles and earthmovers could not go inside the lake, officials used explosives to demolish the structure. They also claimed that notices were issued to the structure owner a few days ago.

All necessary precautions were taken to ensure there was no untoward incident, they said. All the officials and workers climbed on two other buildings that were close to the lake. The entire exercise went on for an hour and soon after the blast, the structure collapsed. However, due to the blast impact, debris hit Gopal, resulting in head injuries. Officials shifted him to a local hospital and after preliminary treatment, he was shifted to Hyderabad in the evening for better treatment. Officials claimed that he was out of danger.

Narasimlu, a native of Patancheru had constructed the structure inside the full tank level limits of the lake. The structure was equipped with a staircase, which enabled residents to enter the building without stepping into water. The structure owner family members used to utilize it as a weekend home, reports said.