LUCKNOW, Nov. 4 -- At least 15 people, including four children, were injured after a 20,000-litre water tank burst during a mermaid show at the Dada Miyan Urs, in Bahraich district, on Monday night. The surging water triggered panic among spectators. The incident took place around 9pm at Khalidpur village under Fakharpur police station limits, about 20 km from the district headquarters. The tank's glass wall shattered under the pressure of the escaping water, sending shards flying into the audience and injuring several people in the face and head. "Four people, including the Urs committee president and the mermaid show operator, have been detained. Seven people have been booked. The tank burst due to excessive water pressure," said Bahraich additional SP city Ayush Vikram Singh....