New Delhi, Oct. 7 -- A blast took place in the basement of Tower A at Triveni Heights in Dwarka Sector 16B on Sunday evening when a combination of accumulated gases and high groundwater pressure cracked the ground, pushing it upwards and causing flooding in the area, the DDA said on Monday. The incident took place around 7.30pm, when residents noticed the basement was filled with water and slabs of cement were scattered across the floor. "The ground was cracked, with slabs of cement scattered across the area. It was clear that an explosion had occurred, but we did not know what it was due to. We informed police and the DDA," said B.G. Mishra, president, RWA, Triveni Heights. Residents said no one was injured, as basement was vacant at the time. Locals also reported structural damage. In a statement, the DDA said there was no threat to residents' safety. "The building is structurally safe and has been assessed for stability. Top-tier structural and geotechnical experts are conducting detailed assessment. "it said....