Kanpur, Jan. 24 -- A powerful explosion rocked a residence in the Bajaria police station area of Kanghi Mohal here, causing extensive damage to the third floor of the building, on Tuesday. The a deafening blast has left four persons, including a child, seriously injured. The house where the explosion took place, belonged to one Tipu. His son, Aamir, 28, along with his wife Gazala, 24, and their seven-year-old daughter Tuba, were trapped in the debris. The explosion was so intense that it shattered windows in the neighbouring houses, creating panic in the entire locality. The fire brigade and police were alerted, and a rescue operation was initiated....