Two high-rise apartment towers in India were leveled to the ground in a controlled demolition on Sunday after the country’s top court declared them illegal for violating building norms, officials said. They became India’s tallest structures to be razed to the ground.

More than 1,500 families vacated their apartments in the area more than seven hours before the nearly 100-meter- (328 feet) tall towers crumbled inward by the impact of the implosion. The 32-story and 29-story towers, which were being constructed by a private builder in Noida city on the outskirts of New Delhi, were yet to be occupied.

“Largely, everything is OK,” said Ritu Maheshwari, a government administrator, after the demolition. “It happened as expected.”

The demolition was completed within seconds but followed a 12-year court battle between residents in the area and the builder, Supertech Limited.

The razing of the towers occurred after the Supreme Court found that the builder, in collusion with government officials, violated laws prohibiting construction within a certain distance from nearby buildings.

The Supreme Court said the construction of the two towers also was illegal because the builder did not receive mandatory consent from other apartment owners in the area.

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