At least 25 people were arrested and seven cases registered against 400 people after four people were killed in violence over the survey of a mosque in Uttar Pradesh's Sambhal on Sunday. Samajwadi Party MP from Sambhal, Ziaur Rahman Barq, and his party colleague Iqbal Mahmood's son Nawab Suhail Iqbal, are among those who have been charged, officials said.