Shiv Sena leader Harish Singla has been arrested after a clash broke out in Patiala today during an anti-Khalistan protest march. The clash took place outside the Kali Mata temple when members of an outfit that calls itself Shiv Sena (Bal Thackeray) began a 'Khalistan Murdabad March'. Members of the two groups also waved swords and threw stones at each other.