NEW DELHI  - The Taliban vowed on Thursday to avenge the execution of Mohammed Kasab, the sole surviving gunman from the 2008 Mumbai attacks.Kasab, a 25-year-old Pakistani, was hanged in western India on Wednesday after being convicted of "waging war on India" for his role in the three-day assault on India's commercial capital.The Taliban said it wanted Kasab's body returned to Pakistan otherwise it would unleash reprisals, spokesman Ehsanullah Ehsan told AFP by telephone from an undisclosed location."We will take revenge of Kasab's martyrdom," Ehsan said. "We strongly demand that his body be returned to Pakistan. If the body is not handed over (to the family) our reaction will be more severe."Indian officials said efforts had been made to contact Kasab's family in Pakistan before his death and added that no request for his body had been received from his relatives or the government.